Public Class: ASE Version 16.2 26th January 2024 ST(Security Target) Lite  2013 Samsung Electronics Co., Ltd. All rights reserved. Common Criteria Information Technology Security Evaluation S3FT9MF/S3FT9MT/S3FT9MS Important Notice Samsung Electronics Co. Ltd. (“Samsung”) reserves the right to make changes to the information in this publication at any time without prior notice. All information provided is for reference purpose only. Samsung assumes no responsibility for possible errors or omissions, or for any consequences resulting from the use of the information contained herein. This publication on its own does not convey any license, either express or implied, relating to any Samsung and/or third-party products, under the intellectual property rights of Samsung and/or any third parties. Samsung makes no warranty, representation, or guarantee regarding the suitability of its products for any particular purpose, nor does Samsung assume any liability arising out of the application or use of any product or circuit and specifically disclaims any and all liability, including without limitation any consequential or incidental damages. Customers are responsible for their own products and applications. “Typical” parameters can and do vary in different applications. All operating parameters, including “Typicals” must be validated for each customer application by the customer’s technical experts. Samsung products are not designed, intended, or authorized for use in applications intended to support or sustain life, or for any other application in which the failure of the Samsung product could reasonably be expected to create a situation where personal injury or death may occur. Customers acknowledge and agree that they are solely responsible to meet all other legal and regulatory requirements regarding their applications using Samsung products notwithstanding any information provided in this publication. Customer shall indemnify and hold Samsung and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, expenses, and reasonable attorney fees arising out of, either directly or indirectly, any claim (including but not limited to personal injury or death) that may be associated with such unintended, unauthorized and/or illegal use. WARNING No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electric or mechanical, by photocopying, recording, or otherwise, without the prior written consent of Samsung. This publication is intended for use by designated recipients only. This publication contains confidential information (including trade secrets) of Samsung protected by Competition Law, Trade Secrets Protection Act and other related laws, and therefore may not be, in part or in whole, directly or indirectly publicized, distributed, photocopied or used (including in a posting on the Internet where unspecified access is possible) by any unauthorized third party. Samsung reserves its right to take any and all measures both in equity and law available to it and claim full damages against any party that misappropriates Samsung’s trade secrets and/or confidential information. 警 告 本文件仅向经韩国三星电子株式会社授权的人员提供， 其内容含有商业秘密保护相关法规规定并受其保护的三星电 子株式会社商业秘密，任何直接或间接非法向第三人披露、 传播、复制或允许第三人使用该文件全部或部分内容的行为 （包括在互联网等公开媒介刊登该商业秘密而可能导致不特 定第三人获取相关信息的行为）皆为法律严格禁止。此等违 法行为一经发现，三星电子株式会社有权根据相关法规对其 采取法律措施，包括但不限于提出损害赔偿请求。 Copyright  2013 Samsung Electronics Co., Ltd. Samsung Electronics Co., Ltd. San #24 Nongseo-Dong, Giheung-Gu Yongin-City, Gyeonggi-Do, Korea 446-711 Contact Us: junghyun.kim@samsung.com Home Page: http://www.samsungsemi.com Chip Handling Guide Precaution against Electrostatic Discharge When using semiconductor devices, ensure that the environment is protected against static electricity: 1. Wear antistatic clothes and use earth band. 2. All objects that are in direct contact with devices must be made up of materials that do not produce static electricity. 3. Ensure that the equipment and work table are earthed. 4. Use ionizer to remove electron charge. Contamination Do not use semiconductor products in an environment exposed to dust or dirt adhesion. Temperature/Humidity Semiconductor devices are sensitive to:  Environment  Temperature  Humidity High temperature or humidity deteriorates the characteristics of semiconductor devices. Therefore, do not store or use semiconductor devices in such conditions. Mechanical Shock Do not to apply excessive mechanical shock or force on semiconductor devices. Chemical Do not expose semiconductor devices to chemicals because exposure to chemicals leads to reactions that deteriorate the characteristics of the devices. Light Protection In non- Epoxy Molding Compound (EMC) package, do not expose semiconductor IC to bright light. Exposure to bright light causes malfunctioning of the devices. However, a few special products that utilize light or with security functions are exempted from this guide. Radioactive, Cosmic and X-ray Radioactive substances, cosmic ray, or X-ray may influence semiconductor devices. These substances or rays may cause a soft error during a device operation. Therefore, ensure to shield the semiconductor devices under environment that may be exposed to radioactive substances, cosmic ray, or X-ray. EMS (Electromagnetic Susceptibility) Strong electromagnetic wave or magnetic field may affect the characteristic of semiconductor devices during the operation under insufficient PCB circuit design for Electromagnetic Susceptibility (EMS). Revision History Version Date Modification 1.0 14th December 2013 - Creation 1.1 02th April 2014 Update the section 1.1 and table 1 3.0 12th June 2014 Update the section 1.1 and table 1 5.0 8th October 2014 Update the section 1.1, table 1 and section6.2 for EAL6+ Added the section 7.2 for EAL6+ 7.0 8th July 2015 Update the section 1.2.4 and table 1. 7.1 24th July 2015 Miscellaneous update to conform with PP0084 7.1 24th July 2015 Miscellaneous update to conform with PP0084 7.2 25th August 2015 Update the chapter 1.2.2, 6.1 and 7.1 for RNG 8.0 15th December 2015 Update the section 1.1, 1.2 and table 1 8.1 17th December 2015 Update the section table 1 and chapter 7.1 9.0 26th July 2016 The chapter 4.1.3, chapter 4.4 and table 4and are updated Update the table 1 The contents are updated about “Diffusion of open samples” 9.1 27th July 2016 Update the chapter 7.1 9.2 16th December 2016 Update the table 1 and Remove the blank page 10.0 19th December 2017 Update the table 1 Chapter 1.1, 1.2, 2.1 and 8.3 are updated. 10.1 20th December 2017 Chapter 6.1.8 is updated. 11.0 12th December 2018 Chapter 1.1, 1.2, 6.1 and 7.1 are updated. 12.0 28th November 2019 - Update the table 1 - Chapter 1.2, 5, 6.2 and 8.3 are updated. 13.0 05th October 2020 - Update the table 1 - Chapter 1.2.4 is updated 14.0 1st November 2021 - Update the table 1 - Chapter 1.2.4 is updated 14.1 2nd November 2021 - Update the table 1 14.2 10th November 2021 - Update the table 1 15.0 12th December 2022 - Chapter 1, 2, 6 are updated. 15.1 13th December 2022 - Chapter 1, 7 are updated 16.0 27th November 2023 - Chapter 1, 2, 6 and 8 are updated 16.1 30th November 2023 - Chapter 1,2 and 6 are updated 16.2 26th January 2024 - Chapter 1,6and 8 are updated Table of Contents 1 ST INTRODUCTION................................................................................... 14 1.1 Security Target and TOE Reference .........................................................................................................15 1.2 TOE Overview and TOE Description.......................................................................................................16 1.2.1 Introduction......................................................................................................................................16 1.2.2 TOE Definition .................................................................................................................................16 1.2.3 TOE Features....................................................................................................................................23 1.2.4 TOE Life cycle...................................................................................................................................25 1.3 Interfaces of the TOE................................................................................................................................26 1.4 TOE Intended Usage................................................................................................................................27 2 CONFORMANCE CLAIMS ......................................................................... 28 2.1 CC Conformance Claim...........................................................................................................................29 2.2 Package Claim .........................................................................................................................................29 2.3 Conformance Claim Rationale.................................................................................................................29 3 SECURITY PROBLEM DEFINITION .......................................................... 31 3.1 Description of Assets ...............................................................................................................................31 3.2 Threats.....................................................................................................................................................33 3.2.1 Standard Threats ..............................................................................................................................35 3.2.2 Threats related to security services...................................................................................................37 3.2.3 Threats related to additional TOE Specific Functionality..................................................................38 3.2.4 Threats related to Authentication of the Security IC.........................................................................38 3.2.5 Threats related to Diffusion of open samples ...................................................................................38 3.3 Organizational Security Policies ..............................................................................................................39 3.4 Assumptions............................................................................................................................................41 4 SECURITY OBJECTIVES............................................................................. 43 4.1 Security Objectives for the TOE ...............................................................................................................44 4.1.1 Standard Security Objectives ............................................................................................................45 4.1.2 Security Objectives related to Specific Functionality (referring to SG4) ............................................47 4.1.3 Security Objectives for Added Function ...........................................................................................48 4.2 Security Objectives for the Security IC Embedded Software....................................................................50 4.2.1 Clarification of “Treatment of User Data (OE.Resp-Appl)” ..............................................................50 4.3 Security Objectives for the Operational Environment..............................................................................50 4.3.1 Clarification of “Protection during Composite Product Manufacturing (OE.Process-Sec-IC)”.........51 4.4 Security Objectives Rationale...................................................................................................................52 5 EXTENDED COMPONENTS DEFINITION................................................ 55 5.1 Definition of the Family FCS_RNG..........................................................................................................56 5.2 Definition of the Family FMT_LIM ..........................................................................................................57 5.3 Definition of the Family FAU_SAS ..........................................................................................................59 5.4 Definition of the Family FDP_SDC ..........................................................................................................60 5.5 Definition of the Family FIA_API ............................................................................................................61 6 IT SECURITY REQUIREMENTS ................................................................. 63 6.1 Security Functional Requirements for the TOE........................................................................................64 6.1.1 Malfunctions.....................................................................................................................................64 6.1.2 Abuse of Functionality .....................................................................................................................64 6.1.3 Physical Manipulation and Probing .................................................................................................65 6.1.4 Leakage ............................................................................................................................................67 6.1.5 Random Numbers (DTRNG FRO)....................................................................................................68 6.1.6 Alternative Random Numbers (EHP DTRNG FRO).........................................................................69 6.1.7 Memory Access Control ...................................................................................................................69 6.1.8 Cryptographic Support.....................................................................................................................72 6.1.9 Triple-DES Operation.......................................................................................................................72 6.1.10 AES Operation................................................................................................................................73 6.1.11 Rivest-Shamir-Adleman (RSA) Operation (optional)......................................................................74 6.1.12 Rivest-Shamir-Adleman (RSA) Key Generation (optional).............................................................74 6.1.13 Elliptic Curve DSA Operation (optional)........................................................................................75 6.1.14 Elliptic Curve DSA Key Generation (optional) ...............................................................................75 6.1.15 Elliptic Curve Diffie-Hellman (ECDH) Key Agreement (optional).................................................77 6.1.16 Secure Hash Algorithm (SHA) (optional) .......................................................................................78 6.1.17 Bootloader ......................................................................................................................................78 6.1.18 Authentication Proof of Identity.....................................................................................................81 6.1.19 Summary of Security Functional Requirements..............................................................................82 6.2 TOE Assurance Requirements .................................................................................................................84 6.3 Security Requirements Rationale.............................................................................................................86 6.3.1 Rationale for the Security Functional Requirements.........................................................................86 6.3.2 Dependencies of Security Functional Requirements.........................................................................91 6.3.3 Rationale for the Assurance Requirements.......................................................................................94 6.3.4 Security Requirements are Internally Consistent..............................................................................95 7 TOE SUMMARY SPECIFICATION............................................................. 98 7.1 List of Security Functional Requirements ................................................................................................99 7.2 Architectural Design Summary..............................................................................................................106 8 ANNEX........................................................................................................108 8.1 Glossary.................................................................................................................................................108 8.2 Abbreviations ........................................................................................................................................110 8.3 References..............................................................................................................................................111 List of Figures Figure Title Page Number Number Figure 1 S3FT9MF/S3FT9MT/S3FT9MS Block Diagram.....................................................................................17 Figure 2 Definition of “TOE Delivery” and responsible Parties...........................................................................26 Figure 3 Standard Threats....................................................................................................................................34 Figure 4 Threats related to security service..........................................................................................................34 Figure 5 Interactions between the TOE and its outer world.................................................................................35 Figure 6 Policies...................................................................................................................................................39 Figure 7 Assumptions..........................................................................................................................................41 Figure 8 Standard Security Objectives .................................................................................................................44 Figure 9 Security Objectives related to Specific Functionality..............................................................................45 List of Tables Table Title Page Number Number Table 1 TOE Configuration ................................................................................................................................23 Table 2 Security Objectives versus Assumptions, Threats or Policies ................................................................52 Table 3 Security Functional Requirements defined in Smart Card IC Protection Profile....................................82 Table 4 Augmented Security Functional Requirements .....................................................................................83 Table 5 Security Requirements versus Security Objectives ................................................................................87 Table 6 Dependencies of the Security Functional Requirements........................................................................93 List of Conventions Register RW Access Type Conventions Type Definition Description R Read Only The application has permission to read the Register field. Writes to read-only fields have no effect. W Write Only The application has permission to write in the Register field. RW Read & Write The application has permission to read and writes in the Register field. The application sets this field by writing 1’b1 and clears it by writing 1’b0. Register Value Conventions Expression Description x Undefined bit X Undefined multiple bits ? Undefined, but depends on the device or pin status Device dependent The value depends on the device Pin value The value depends on the pin status Reset Value Conventions Expression Description 0 Clears the register field 1 Sets the register field x Don't care condition Warning: Some bits of control registers are driven by hardware or write operation only. As a result the indicated reset value and the read value after reset might be different. List of Terms Terms Descriptions Application Data All data managed by the Security IC Embedded Software in the application context. Application data comprise all data in the final Security IC. Composite Product Integrator Role installing or finalising the IC Embedded Software and the applications on platform transforming the TOE into the unpersonalised Composite Product after TOE delivery. The TOE Manufacturer may implement IC Embedded Software delivered by the Security IC Embedded Software Developer before TOE delivery (e.g. if the IC Embedded Software is implemented in ROM or is stored in the non-volatile memory as service provided by the IC Manufacturer or IC Packaging Manufacturer) Composite Product Manufacturer The Composite Product Manufacturer has the following roles (i) the Security IC Embedded Software Developer (Phase 1), (ii) the Composite Product Integrator (Phase 5) and (iii) the Personaliser (Phase 6). If the TOE is delivered after Phase 3 in form of wafers or sawn wafers (dice) he has the role of the IC Packaging Manufacturer (Phase 4) in addition. End-consumer User of the Composite Product in Phase 7. IC Dedicated Software IC proprietary software embedded in a Security IC (also known as IC firmware) and developed by the IC Developer. Such software is required for testing purpose (IC Dedicated Test Software) but may provide additional services to facilitate usage of the hardware and/or to provide additional services (IC Dedicated Support Software). IC Dedicated Test Software That part of the IC Dedicated Software (refer to above) which is used to test the TOE before TOE Delivery but which does not provide any functionality thereafter. IC Dedicated Support Software That part of the IC Dedicated Software (refer to above) which provides functions after TOE Delivery. The usage of parts of the IC Dedicated Software might be restricted to certain phases. Initialisation Data Initialisation Data defined by the TOE Manufacturer to identify the TOE and to keep track of the Security IC’s production and further life-cycle phases are considered as belonging to the TSF data. These data are for instance used for traceability and for TOE identification (identification data). Integrated Circuit (IC) Electronic component(s) designed to perform processing and/or memory functions. Pre-personalisation Data Any data supplied by the Card Manufacturer that is injected into the non-volatile memory by the Integrated Circuits manufacturer (Phase 3). These data are for instance used for traceability and/or to secure shipment between phases. Security IC Composition of the TOE, the Security IC Embedded Software, User Data and the package (the Security IC carrier). Security IC Embedded Software Software embedded in a Security IC and normally not being developed by the IC Designer. The Security IC Embedded Software is designed in Phase 1 and embedded into the Security IC in Phase 3 or in later phases of the Security IC product life-cycle. Some part of that software may actually implement a Security IC application others may provide standard services. Nevertheless, this distinction doesn’t matter here so that the Security IC Embedded Software can be considered as being application dependent whereas the IC Dedicated Software is definitely not. Security IC Product Composite product which includes the Security Integrated Circuit (i.e. the TOE) and the Embedded Software and is evaluated as composite target of evaluation in the sense of the Supporting Document TOE Delivery The period when the TOE is delivered which is either (i) after Phase 3 (or before Phase 4) if the TOE is delivered in form of wafers or sawn wafers (dice) or (ii) after Phase 4 (or before Phase 5) if the TOE is delivered in form of packaged products. TOE Manufacturer The TOE Manufacturer must ensure that all requirements for the TOE and its development and production environment are fulfilled. The TOE Manufacturer has the following roles: (i) IC Developer (Phase 2) and (ii) IC Manufacturer (Phase 3). If the TOE is delivered after Phase 4 in form of packaged products, he has the role of the (iii) IC Packaging Manufacturer (Phase 4) in addition. TSF data Data created by and for the TOE, that might affect the operation of the TOE. This includes information about the TOE’s configuration, if any is coded in non-volatile non- programmable memories (ROM), in specific circuitry, in non-volatile programmable memories (for instance E2PROM) or a combination thereof. User data All data managed by the Smartcard Embedded Software in the application context. User data comprise all data in the final Smartcard IC except the TSF data. List of Acronyms Acronyms Descriptions CC Common Criteria EAL Evaluation Assurance Level IT Information Technology PP Protection Profile ST Security Target TOE Target of Evaluation TSC TSF Scope of Control TSF TOE Security Feature TSFI TSF Interface TSP TOE Security Policy Public ST Lite_Ver 16.2 1 ST INTRODUCTION 14/112 1 ST INTRODUCTION 1 This introductory chapter contains the following sections: 1.1 Security Target and TOE Reference 1.2 TOE Overview and TOE Description 1.3 Interfaces of the TOE 1.4 TOE Intended Usage Public ST Lite_Ver 16.2 1 ST INTRODUCTION 15/112 1.1 Security Target and TOE Reference 2 The Security Target Lite version is 16.2 and dated 26th January 2024 The Security Target Lite is strictly compliant to 3 [5] Eurosmart Security IC Platform Protection Profile with Augmentation Packages, Version 1.0, BSI-CC- PP-0084-2014. 4 The Protection Profile and the Security Target are built on Common Criteria version 3.1.  Title: Security Target Lite of S3FT9MF/S3FT9MT/S3FT9MS  Target of Evaluation: S3FT9MF/S3FT9MT/S3FT9MS  TOE reference: S3FT9MF_20231219  Provided by: Samsung Electronics Co., Ltd.  Common Criteria version: 5 [1] Common Criteria, Part 1: Common Criteria for Information Technology Security Evaluation, Part 1: Introduction and General Model, Version 3.1, Revision 5, April 2017, CCMB-2017-04-001 6 [2] Common Criteria, Part 2: Common Criteria for Information Technology Security Evaluation,Part2: Security Functional Components, Version 3.1, Revision 5, April 2017, CCMB-2017-04-002 7 [3] Common Criteria, Part 3: Common Criteria for Information Technology Security Evaluation, Part 3: Security Assurance Components, Version 3.1, Revision 5, April 2017, CCMB-2017-04-003 8 [4] Common Methodology for Information Technology Security Evaluation, Evaluation Methodology, Version 3.1, Revision 5, April 2017, CCMB-2017-04-004 Public ST Lite_Ver 16.2 1 ST INTRODUCTION 16/112 1.2 TOE Overview and TOE Description 1.2.1 Introduction 9 The Target of Evaluation (TOE), the S3FT9MF/S3FT9MT/S3FT9MS microcontroller featuring the TORNADO2MX2 cryptographic coprocessor, is a smartcard integrated circuit which is composed of a processing unit, security components, contactless and contact based I/O ports, hardware circuit for testing purpose during the manufacturing process and volatile and non-volatile memories (hardware). The TOE also includes any IC Designer/Manufacturer proprietary IC Dedicated Software as long as it physically exists in the smartcard integrated circuit after being delivered by the IC Manufacturer. Such software (also known as IC firmware) is used for testing purpose during the manufacturing process but also provides additional services to facilitate the usage of the hardware and/or to provide additional services, including optional public key cryptographic library, an [6]AIS31 compliant random number generation library and an [6]AIS31 compliant random number generator. The The RSA/ECC/SHA libraries further include the functionality of hash computation. The use for keyed hash operations like HMAC or similar security critical operations involving keys and other secrets, is not subject of this TOE and requires specific security improvements and DPA analysis including the operating system, which is not part of this TOE. However, this functionality is intended to be used for signature generation and verification only. All other software is called Smartcard Embedded Software and is not part of the TOE. 10 Regarding the RSA/ECC/SHA libraries, the user has the possibility to tailor these IC Dedicated Software parts of the TOE during the manufacturing process by deselecting the RSA/ECC/SHA libraries. Hence the TOE can be delivered with or without the functionality of the RSA/ECC/SHA libraries what’s resulting in two TOE configurations. This is considered in this Security Target and corresponding notes (indicated by “optional”) are added where required. If the user decides not to use the RSA/ECC/SHA cryptographic libraries, the libraries are not delivered to the user and the accompanying “Cryptographic service Rivest- Shamir-Adleman” (O.RSA), “Cryptographic service Elliptic Curve DSA” (O.ECDSA), “Cryptographic service Elliptic Curve Diffie-Hellman” (O.ECDH) and “Cryptographic service Hash function” (O.SHA) are not provided by the TOE. Deselecting RSA/ECC/SHA libraries means excluding the code implementing functionality, which the user decided not to use. Excluding the code of the deselected functionality has no impact on any other security policy of the TOE, it is exactly equivalent to the situation where the user decides just not to use the functionality. 11 The only difference between S3FT9MF, S3FT9MT and S3FT9MS is at the FLASH memory. 1.2.2 TOE Definition 12 The S3FT9MF/S3FT9MT/S3FT9MS single-chip CMOS micro-controller is designed and packaged specifically for "Smart Card" applications. 13 The CalmRISC16 CPU architecture of the S3FT9MF/S3FT9MT/S3FT9MS microcontroller follows the Harvard style, that is, it has separate program memory and data memory. Both instruction and data can be fetched simultaneously without causing a stall, using separate paths for memory access. 14 The main security features of the S3FT9MF/S3FT9MT/S3FT9MS integrated circuit are: 15 Security sensors, detectors or filters 16 Shields 17 Dedicated tamper-resistant design based on synthesizable glue logic and secure topology Public ST Lite_Ver 16.2 1 ST INTRODUCTION 17/112 18 Dedicated hardware mechanisms against side-channel attacks 19 Secure DES and AES Symmetric Cryptography support 20 Secure TORNADO™2MX2 coprocessor for the support of RSA and ECC cryptographic operations 21 One Hardware Digital True Random Number Generator (DTRNG FRO) that meet P2 class of BSI-AIS31 (German Metric). 22 The IC Dedicated Software includes: 23 - Three modular arithmetic libraries for the support of RSA and ECC (with SHA) cryptographic operations (optional) 24 – Three DTRNG FRO libraries built around Hardware DTRNG FRO together with DTRNG FRO application note that meet some of ANSSI requirements as well as P2 class of BSI-AIS31 (German Metric). 25 The main hardware blocks of the S3FT9MF/S3FT9MT/S3FT9MS Integrated Circuit are described in Figure 1 below ROM SecuCalm CPU FLASH MF MT MS Peripherals monitor DTRNG MPU AES Address and Data Bus(BUS) RAM Clock Timers Detectors & Security Control Power on reset Contact Interface CryptoRAM TORNADO DES DMA RAM Contactless interface IVR (Interal Voltage Regulator) Vcc RST CLK GND L1 L2 SIO Figure 1 S3FT9MF/S3FT9MT/S3FT9MS Block Diagram *Note that only the Triple DES algorithm belongs to the TOE, not the Single DES. 26 The TOE consists of the following Hardware and Software: TOE Hardware  FLASH / RAM / Crypto. RAM / ROM / Flash special area  16-bit Central Processing Unit (CPU)  Internal Voltage Regulator (IVR) Public ST Lite_Ver 16.2 1 ST INTRODUCTION 18/112  Detectors & Security Logic  Filters  Digital True random number generator (DTRNG FRO)  Bilateral Pseudo Random Number Generator (BPRNG)  Memory Protection Unit (MPU)  Triple DES cryptographic coprocessor with 112 or 168 bits key size  AES cryptographic coprocessor with 128 bits, 192bits and 256bits key size  TORNADO2MX2 supporting modular multiplications for the operand size up to 2080-bit and modular additions/subtractions for the operand size up to 512-bit  Hardware UART for contact and contactless I/O modes with 512bytes DMA RAM  Address & data buses  Internal Clock  Timers  Power on Reset  Error Correcting Code (ECC) Test ROM code that is used for testing the chip during production Public ST Lite_Ver 16.2 1 ST INTRODUCTION 19/112 TOE Software 27 The TOE software comprises the following components:  Test ROM code that is used for testing the chip during production (The test ROM code is not part of the TOE).  The CM1 Secure RSA/ECC/SHA libraries (optional) TORNADO2MX2 is a hardware coprocessor for high speed modular multiplications, modular additions and modular subtractions. The CM1 Secure RSA/ECC/SHA libraries are software libraries built on the TORNADO2MX2 coprocessor that provides high level interface for RSA and ECC cryptographic algorithms. The RSA functions of the libraries included in the TOE are:  RSA_KeyGen_Secure (RSA public/private key pair generation)  TND_RSA_SigSTD_Secure (RSA signature generation with the standard method)  TND_RSA_SigCRT_Secure (RSA signature generation with the CRT method)  TND_RSA_Verify (RSA signature verification)  RSA_R2modM_precompute_sec (RSA R^2 value precomputation for the standard method)  RSA_R2modPandQ_precompute_sec (RSA R^2 value precomputation for the CRT method) The libraries support RSA operations of the key size from 32-bit to 2048-bit by step of 2-bit. However, only the key size from 1280-bit up to 2048-bit is within the scope of this evaluation. The functions TND_RSA_SigSTD_Secure and TND_RSA_SigCRT_Secure implement some countermeasures against SPA, DPA and DFA attacks. The RSA_KeyGen_Secure function implements some countermeasures against SPA and DFA attacks. The functions RSA_R2modM_precompute_sec and RSA_R2modPandQ_precompute_sec implement some countermeasures against DFA.  The CM1 Secure RSA/ECC/SHA libraries provide a set of functions to implement ECC cryptographic algorithms. In particular, it provides some functions to implement the ECDSA signing/verifying and the ECDH key exchange protocol. The library implements ECC for general curves over prime fields of size from 192-bit to 512-bit and the only certain curves are in the scope of this evaluation. The ECC functions of the library included in the TOE are:  ECDSA_keygen (Ephemeral or static key pair generation for ECDSA signing/verifying)  ECDSA_sign_digest (ECDSA signature generation for a message digest)  ECDSA_verify_digest (ECDSA signature verification for a message digest)  ECDH_generate (ECDH secret key derivation) The functions ECDSA_keygen, ECDSA_sign_digest and ECDH_generate implement some countermeasures against SPA, DPA and DFA for protecting the private key. The function ECDSA_verify_digest implements some countermeasures against DFA. The base point is assumed to be public. Public ST Lite_Ver 16.2 1 ST INTRODUCTION 20/112 Note1) The RSA/ECC/SHA libraries support any valid elliptic curves over prime fields of size from 192-bit to 512-bit. However, the standard curves listed below whose security has been proven are in the scope of this evaluation. １) [NIST curves]: Curves P-192, P-224, P-256, P-384 ２) [Brainpool curves]: brainpoolP192r1, brainpoolP192t1, brainpoolP224r1, brainpoolP224t1, brainpoolP256r1, brainpoolP256t1, brainpoolP320r1, brainpoolP320t1, brainpoolP384r1, brainpoolP384t1, brainpoolP512r1, brainpoolP512t1 ３) [SEC-recommended curves]: secp192k1, secp192r1, secp224k1, secp224r1, secp256k1, secp256r1, secp384r1 The CM1 Secure RSA/ECC/SHA libraries provides the functions for calculating hash (digest) values using the SHA1, SHA224, SHA256, SHA384 and SHA512 algorithms as specified in [FIPS PUB 180-3], but only those related to SHA224, SHA256, SHA384 and SHA512 listed below are within the scope of this evaluation:  SHA224_init, SHA224_update, SHA224_final  SHA256_init, SHA256_update, SHA256_final  SHA384_init, SHA384_update, SHA384_final  SHA512_init, SHA512_update, SHA512_final These functions are not security relevant functions, i.e. they must not be used to hash security values like keys etc. There are implemented no countermeasures against side channel attacks. The TOE provides the functionality of hash computation if and only if the optional CM1 Secure RSA/ECC/SHA libraries are delivered.  Three Digital True Random Number Generator (DTRNG FRO) libraries compliant with AIS31 Class P2 high.  Three EHP DTRNG FRO libraries that pass statistical tests required by Test Procedure A for AIS31 standard.  Secure Boot Loader can download the encrypted user code with AES 28 The TOE configuration is summarized in table 1 below: Item Type Item Versio n Date Form of delivery Hardware S3FT9MF/S3FT9MT/S3FT9MS 16-Bit RISC Microcontroller for Smart Card 1, 2 Wafer or Module Software Test ROM Code 1.0 - Included in S3FT9MF/MT/MS Test ROM - Test ROM code is not part of the TOE. Software Secure Boot loader code (S3FT9xx_Bootloader_80nm_MF. hex) 5.0 2014.05.27 Included in S3FT9MF/MT/MS in ROM Software DTRNG FRO library (S3FT9XX_DTRNG_lib_v6.0.a) 6.0 2013.11.14 Software Library. This library is delivered as object file and is Public ST Lite_Ver 16.2 1 ST INTRODUCTION 21/112 optionally integrated into user NVM code. Software DTRNG FRO library (S3FT9XX_DTRNG_lib_v6.1.a) 6.1 2019.11.18 Software Library. This library is delivered as object file and is optionally integrated into user NVM code. Software DTRNG FRO library (S3FT9XX_DTRNG_lib_v8.1.a) 8.1 2023.10.24 Software Library. This library is delivered as object file and is optionally integrated into user NVM code. Software EHP DTRNG FRO library (S3FT9XX_EHP_DTRNG_lib_v2. 0.a) 2.0 2015.12.04 Software Library. This library is delivered as object file and is optionally integrated into user NVM code. Software EHP DTRNG FRO library (S3FT9XX_EHP_DTRNG_lib_v2. 2.a) 2.2 2019.11.25 Software Library. This library is delivered as object file and is optionally integrated into user NVM code. Software EHP DTRNG FRO library (S3FT9XX_EHP_DTRNG_lib_v2. 3.a) 2.3 2023.10.31 Software Library. This library is delivered as object file and is optionally integrated into user NVM code. Software (optional) CM1 Secure RSA/ECC/SHA Library (PKA_Lib_CM1_V2.05.a) 2.05 2022.11.01 Software Library. This library is delivered as object file and is optionally integrated into user NVM code. Software (optional) CM1 Secure RSA/ECC/SHA Library (PKA_Lib_CM1_V3.02.a) 3.02 2022.11.29 Software Library. This library is delivered as object file and is optionally integrated into user NVM code. Document S3FT9XX HW DTRNG FRO and DTRNG FRO Library Application Note for DTRNG FRO library v8.1 (S3FT9XX_DTRNG_FRO_AN_v 4.0.pdf) 4.0 2023.11.02 Softcopy Document S3FT9XX HW DTRNG FRO and DTRNG FRO Library Application Note for DTRNG FRO library v6.1 (S3FT9XX_DTRNG_FRO_AN_v 2.23.pdf) 2.23 2023.11.02 Softcopy Document S3FT9XX HW DTRNG FRO and DTRNG FRO Library Application Note for DTRNG FRO library v6.0 (S3FT9XX_DTRNG_FRO_AN_v 1.161.pdf) 1.161 2021.11.01 Softcopy Document S3FT9XX HW DTRNG FRO and EHP DTRNG FRO Library Application Note for EHP 3.0 2023.11.27 Softcopy Public ST Lite_Ver 16.2 1 ST INTRODUCTION 22/112 DTRNG FRO Library v2.3 (S3FT9XX_EHP_DTRNG_FRO_ AN_v3.0.pdf) Document S3FT9XX HW DTRNG FRO and EHP DTRNG FRO Library Application Note for EHP DTRNG FRO Library v2.2 (S3FT9XX_EHP_DTRNG_FRO_ AN_v2.012.pdf) 2.012 2023.11.07 Softcopy Document S3FT9XX HW DTRNG FRO and EHP DTRNG FRO Library Application Note for EHP DTRNG FRO Library v2.0 (S3FT9XX_EHP_DTRNG_FRO_ AN_v1.611.pdf) 1.611 2021.11.01 Softcopy Document CM1 Secure RSA/ECC/SHA Library v2.05 API Manual (CM1 RSA ECC Library API Manual v2.05.pdf) 2.05 2022.11.23 Softcopy Document CM1 Secure RSA/ECC/SHA Library v3.02 API Manual (CM1 RSA ECC Library API Manual v3.02.pdf) 3.02 2022.11.29 Softcopy Document Hardware User’s manual (S3FT9XX_UM_REV1.33.pdf) 1.33 2017.03.20 Softcopy Document USER'S MANUAL ERRATA of S3FT9XX_UM_REV1.33 (S3FT9XX_UM1.33_Errata_v0.3. pdf) 0.3 2020.03 Softcopy Document Security Application Note (SAN_S3FT9MD_MF_MH_v4.0. pdf) 4.0 2023.10.17 Softcopy Document Chip Delivery Specification (S3FT9MF_DV22.pdf) 2.2 2017.12 Softcopy Document Boot Loader Specification (S3FT9xx_80nm_BootloaderSpec ification_v2.4.pdf) 2.4 2017.03.23 Softcopy Document Architecture Reference: SecuCalm CPU Core (S3xT9xx_AR14_SecuCalmCore. pdf) 14 2011.03.03 Softcopy Document Cryptographic Mechanisms (Cryptographic_Mechanisms_S3 FT9MF_v1.0.pdf) 1.0 2022.11.22 Softcopy Public ST Lite_Ver 16.2 1 ST INTRODUCTION 23/112 Address Items The value Refer to the chapter 7 in Delivery specification Device type S3FT9MF: 160F S3FT9MT: 161D S3FT9MS: 161C IC Version 01, 02 Test ROM Code Version 10 Boot loader code version 50 Secure RSA/ECC/SHA Libraries Version CM1 Secure RSA/ECC/SHA Library Version: 2.05 and 3.02 DTRNG Library Version DTRNG FRO Library Version: 6.0, 6.1 and 8.1 EHP DTRNG FRO Library Version: 2.0, 2.2 and 2.3 Table 1 TOE Configuration PRIVILEGE mode and USER mode PRIVILEGE mode USER mode Protected mode for the operating system. All the control registers including security related special registers can be read or written only if CPU runs in this mode. This mode cannot access all control registers. 29 Note: The TOE can be delivered without the RSA/ECC/SHA crypto libraries. In this case the TOE does not provide the Additional Specific Security Functionality Rivest-Shamir-Adleman Cryptography and Elliptic Curve Cryptography (ECC) and Secure Hash Algorithm (SHA). 1.2.3 TOE Features CPU  16-bit SecuCalm core Memory  ROM  FLASH  RAM  Crypto RAM  DMA RAM for Contactless interface Public ST Lite_Ver 16.2 1 ST INTRODUCTION 24/112 FLASH Write Operations Triple DES  Built-in hardware Triple DES accelerator AES  Built-in hardware AES accelerator TORNADO-2Mx2  Built-in hardware accelerator for big number calculation Abnormal Condition Detectors and filters Interrupts  Two interrupt sources and vectors (FIQ, IRQ) Serial I/O Interface  T=0 and 1 (ISO 7816-3)  Type A and Type B contactless interfaces compliant with the ISO 14443 standard Reset and Power Down Mode  Power-on reset and external reset  Stop mode Random Number Generator  A Digital True random number generator (DTRNG FRO): AIS31 P2 high compliant  A Bilateral Pseudo Random Number Generator (BPRNG): no compliance to any specific metric, but BPRNG is used by the chip for internal use Memory Protection Unit  Memory Protection Unit (MPU). Memory Encryption and Bus Scrambling Timers ECC Clock Sources  External clock: 1 MHz–10 MHz Operating Voltage Range  1.62 V - 5.5 V Public ST Lite_Ver 16.2 1 ST INTRODUCTION 25/112 Operating Temperature  - 25°C to 85°C Package  Wafer  8-pin COB (compliant with ISO 7816) 1.2.4 TOE Life cycle 30 The complex development and manufacturing processes of a Composite Product can be separated into seven distinct phases. The phases 2 and 3 of the Composite Product life cycle cover the IC development and production: Site / Building Phase Hwasung Plant Phase 2 Giheung Plant Phase 3 Onyang Plant Phase 3+4 Photronics Plant Phase 3 TOPPAN Plant Phase 3 HANAMICRON Plant Phase 3+4 Inesa Plant Phase 3+4 Eternal Plant Phase 3+4 TESNA Plant Phase 3 ASE Korea Phase 3+4 SFA Plant Phase 4 OCamlPro Support(2)  IC Development (Phase 2): – IC design, – IC Dedicated Software development  the IC Manufacturing (Phase 3): – integration and photomask fabrication, – IC production, – IC testing, – preparation and – Pre-personalisation if necessary 31 The Composite Product life cycle phase 4 can be included in the evaluation of the IC as an option:  the IC Packaging (Phase 4): – Security IC packaging (and testing), – Pre-personalisation if necessary (if not done in phase 3). 32 In addition, three important stages have to be considered in the Composite Product life cycle:  Security IC Embedded Software Development (Phase 1), Public ST Lite_Ver 16.2 1 ST INTRODUCTION 26/112  the Composite Product finishing process, preparation and shipping to the personalisation line for the Composite Product (Composite Product Integration Phase 5), Package in Phase 5 Description Package 1 Loader dedicated for usage in Secured Environment only Package 2 Loader dedicated for usage by authorized users only  the Composite Product personalisation and testing stage where the User Data is loaded into the Security IC's memory (Personalisation Phase 6),  the Composite Product usage by its issuers and consumers (Operational Usage Phase 7) which may include loading and other management of applications in the field. Device is in Test mode Device is in Normal mode Figure 2 Definition of “TOE Delivery” and responsible Parties 33 The Security IC Embedded Software is developed outside the TOE development in Phase 1. The TOE is developed in Phase 2 and produced in Phase 3. Then the TOE is delivered in form of wafers. The TOE can also be delivered in form of packaged products. In this case, the development and production of the TOE not only pertain to Phase 2 and 3 but to Phase 4 in addition. 1.3 Interfaces of the TOE  The physical interface of the TOE with the external environment is the entire surface of the IC  The electrical interface of the TOE with the external environment is made of the chip’s pads including the Vdd, RESETB, XCLK, GND, IO1, L1 and L2 as well as the contactless radio-frequency interface  The data interface of the TOE is made of the Contact I/O pads and Contactless I/O pads.  The software interface of the TOE with the hardware consists of Special Function Registers (SFR) and CPU instructions.  The TRNG interface of the TOE is defined by the DTRNG FRO and EHP DTRNG FRO libraries interface. Public ST Lite_Ver 16.2 1 ST INTRODUCTION 27/112  The RSA interface of the TOE is defined by the RSA/ECC/SHA library interface (optional).  The interface to the ECC and SHA calculations is defined from the RSA/ECC/SHA library interface (optional) 1.4 TOE Intended Usage 34 The TOE is dedicated to applications such as:  Banking and finance applications for credit or debit cards, electronic purse (stored value cards) and electronic commerce.  Network based transaction processing such a mobile phones (GSM SIM cards), pay TV (subscriber and pay-per-view cards), communication highways (Internet access and transaction processing).  Transport and ticketing applications (access control cards).  Governmental cards (ID cards, health cards, driving licenses).  Multimedia applications and Digital Right Management protection. Public ST Lite_Ver 16.2 2 CONFORMANCE CLAIMS 28/112 2 CONFORMANCE CLAIMS 35 This chapter 2 contains the following sections: 2.1 CC Conformance Claim 2.2 PP Claim 2.3 Package Claim 2.4 Conformance Claim Rationale Public ST Lite_Ver 16.2 2 CONFORMANCE CLAIMS 29/112 2.1 CC Conformance Claim 36 This Security target claims to be conformant to the Common Criteria version 3.1 R5. 37 Furthermore it claims to be CC Part 2 extended and CC Part 3 conformant. The extended Security Functional Requirements are defined in chapter 5. 38 This Security Target has been built with the Common Criteria for Information Technology Security Evaluation; Version 3.1 which comprises [1] Common Criteria, Part 1: Common Criteria for Information Technology Security Evaluation, Part 1: Introduction and General Model, Version 3.1, Revision 5, April 2017, CCMB-2017-04-001 [2] Common Criteria, Part 2: Common Criteria for Information Technology Security Evaluation, Part 2: Security Functional Components, Version 3.1, Revision 5, April 2017, CCMB-2017-04-002 [3] Common Criteria, Part 3: Common Criteria for Information Technology Security Evaluation, Part 3: Security Assurance Components, Version 3.1, Revision 5, April 2017, CCMB-2017-04-003 [4] Common Methodology for Information Technology Security Evaluation, Evaluation Methodology, Version 3.1, Revision 5, April 2017, CCMB-2017-04-004 has been taken into account. 2.2 PP Claim 39 This Security Target is strictly compliant to the Security IC Platform Protection Profile [5]. The Security IC Platform Protection Profile is registered and certified by the Bundesamt für Sicherheit in der Informationstechnik (BSI) under the reference BSI-CC-PP-0084, Version 1.0, dated 01.2014. This ST does not claim conformance to any other PP. 2.3 Package Claim 40 This Security Target is strictly compliant to the Security IC Platform Protection Profile [5] with additional packages: • Package “Authentication of the Security IC”, “TDES”, “AES” and “Hash functions” • Package 1: Loader dedicated for usage in secured environment only • Package 2: Loader dedicated for usage by authorized users only 41 The assurance level for this Security Target is EAL6 augmented with ASE_TSS.2. 2.4 Conformance Claim Rationale 42 This security target claims strict conformance only to one PP, the Security IC Platform Protection Profile [5]. 43 The Evaluation Assurance Level (EAL) of the PP [5] is EAL 4 augmented with the assurance components ALC_DVS.2 and AVA_VAN.5. The Assurance Requirements of the TOE obtain the Evaluation Assurance Level 6 augmented with the assurance component ASE_TSS.2 for the TOE. 44 The Target of Evaluation (TOE) is a complete solution implementing a security integrated circuit (security Public ST Lite_Ver 16.2 2 CONFORMANCE CLAIMS 30/112 IC) as defined in the PP [5] section 1.3.1, so the TOE is consistent with the TOE type in the PP [5]. 45 The security problem definition of this security target is consistent with the statement of the security problem definition in the PP [5], as the security target claimed strict conformance to the PP [5]. Additional threats, organisational security policies and assumptions are introduced in chapter 3 of this ST, a rationale is given in chapter 4.4. 46 The security objectives of this security target are consistent with the statement of the security objectives in the PP [5], as the security target claimed strict conformance to the PP [5]. Additional security objectives are added in chapter 4.1 of this ST, a rationale is given in chapter 4.4. 47 The security requirements of this security target are consistent with the statement of the security requirements in the PP [5], as the security target claimed strict conformance to the PP [5]. Additional security requirements are added in chapter 6.1 of this ST, a rationale is given in chapter 6.3. All assignments and selections of the security functional requirements are done in the PP [5] and in this security target section 6.1. Public ST Lite_Ver 16.2 3 SECURITY PROBLEM DEFINITION 31/112 3 SECURITY PROBLEM DEFINITION 48 This chapter 3 contains the following sections: 3.1 Description of Assets 3.2 Threats 3.3 Organizational Security Policies 3.4 Assumptions 3.1 Description of Assets Assets regarding the Threats 49 The assets (related to standard functionality) to be protected are  the User Data of the Composite TOE,  the Security IC Embedded Software stored and in operation,  the security services provided by the TOE for the Security IC Embedded Software. 50 The user (consumer) of the TOE places value upon the assets related to high-level security concerns: SC1 integrity of User Data of the Composite TOE, SC2 confidentiality of User Data and of the Composite TOE being stored in the TOE’s protected memory areas, SC3 correct operation of the security services provided by the TOE for the Security IC Embedded Software. Note the Security IC Embedded Software is user data and shall be protected while being executed/processed and while being stored in the TOE’s protected memories 51 The Security IC may not distinguish between user data which is public knowledge or kept confidential. Therefore the security IC shall protect the user data of the Composite TOE in integrity and in confidentiality if stored in protected memory areas, unless the Security IC Embedded Software chooses to disclose or modify it. 52 In particular integrity of the Security IC Embedded Software means that it is correctly being executed which includes the correct operation of the TOE’s functionality. Parts of the Security IC Embedded Software which do not contain secret data or security critical source code, may not require protection from being disclosed. Other parts of the Security IC Embedded Software may need to be kept confidential since specific implementation details may assist an attacker. Public ST Lite_Ver 16.2 3 SECURITY PROBLEM DEFINITION 32/112 53 This Protection Profile requires the TOE to provide at least one security service: the generation of random numbers by means of a physical Random Number Generator. The annex 7 provides packages for typical additional security services. The Security Target may require additional security services as described in these packages or define TOE specific security services. It is essential that the TOE ensures the correct operation of all security services provided by the TOE for the Security IC Embedded Software. 54 According to the Protection Profile there is the following high-level security concern related to security service: SC4 deficiency of random numbers. 55 To be able to protect these assets (SC1 to SC4) the TOE shall self-protect its TSF. Critical information about the TSF shall be protected by the development environment and the operational environment. Critical information may include:  logical design data, physical design data, IC Dedicated Software, and configuration data,  Initialisation Data and Pre-personalisation Data, specific development aids, test and characterisation related data, material for software development support, and photomasks. 56 Such information and the ability to perform manipulations assist in threatening the above assets. 57 Note that there are many ways to manipulate or disclose the user data of the Composite TOE: (i) An attacker may manipulate the Security IC Embedded Software or the TOE. (ii) An attacker may cause malfunctions of the TOE or abuse Test Features provided by the TOE. Such attacks usually require design information of the TOE to be obtained. They pertain to all information about (i) the circuitry of the IC (hardware including the physical memories), (ii) the IC Dedicated Software with the parts IC Dedicated Test Software (if any) and IC Dedicated Support Software (if any), and (iii) the configuration data for the TSF. The knowledge of this information may enable or support attacks on the assets. Therefore the TOE Manufacturer must ensure that the development and production of the TOE (refer to Section 1.2.3) is secure so that no restricted, sensitive, critical or very critical information is unintentionally made available for attacks in the operational phase of the TOE (cf. [8] for details on assessment of knowledge of the TOE in the vulnerability analysis). 58 The TOE Manufacturer must apply protection to support the security of the TOE. This not only pertains to the TOE but also to all information and material exchanged with the developer of the Security IC Embedded Software. This covers the Security IC Embedded Software itself if provided by the developer of the Security IC Embedded Software or any authentication data required to enable the download of software. This includes the delivery (exchange) procedures for Phase 1 and the Phases after TOE Delivery as far as they can be controlled by the TOE Manufacturer. These aspects enforce the usage of the supporting documents and the refinements of SAR defined in the protection profile. 59 The information and material produced and/or processed by the TOE Manufacturer in the TOE development and production environment (Phases 2 up to TOE Delivery) can be grouped as follows: ● logical design data, ● physical design data, ● IC Dedicated Software, Initialisation Data and Pre-personalisation Data, ● Security IC Embedded Software, provided by the Security IC Embedded Software developer and implemented by the IC manufacturer, ● specific development aids, ● test and characterisation related data, Public ST Lite_Ver 16.2 3 SECURITY PROBLEM DEFINITION 33/112 ● material for software development support, and ● photomasks and products in any form as long as they are generated, stored, or processed by the TOE Manufacturer. 3.2 Threats 60 The following explanations help to understand the focus of the threats and objectives defined below. For example, certain attacks are only one step towards a disclosure of assets, others may directly lead to a compromise of the application security.  Manipulation of user data (which includes user data and code of the Composite TOE, stored in or processed by the Security IC) means that an attacker is able to alter a meaningful block of data. This should be considered for the threats T.Malfunction, T.Phys-Manipulation and T.Abuse-Func  Disclosure of user data (which may include user data and code of the Composite TOE, stored in protected memory areas or processed by the Security IC) or TSF data means that an attacker is realistically3F2 able to determine a meaningful block of data. This should be considered for the threats T.Leak-Inherent, T.Phys-Probing, T.Leak-Forced and T.Abuse-Func.  Manipulation of the TSF or TSF data means that an attacker is able to deliberately deactivate or otherwise change the behaviour of a specific security functionality in a manner which enables exploitation. This should be considered for the threat T.Malfunction, T.Phys-Manipulation and T.Abuse-Func. 61 The cloning of the functional behaviour of the Security IC on its physical and command interface is the highest level security concern in the application context. 62 The cloning of that functional behaviour requires to (i) develop a functional equivalent of the Security IC Embedded Software, (ii) disclose, interpret and employ the user data of the Composite TOE stored in the TOE, and (iii) develop and build a functional equivalent of the Security IC using the input from the previous steps. 63 The Security IC is a platform for the Security IC Embedded Software which ensures that especially the critical user data of the Composite TOE are stored and processed in a secure way (refer to below). The Security IC Embedded Software must also ensure that critical user data of the Composite TOE are treated as required in the application context. In addition, the personalisation process supported by the Security IC Embedded Software (and perhaps by the Security IC in addition) must be secure. This last step is beyond the scope of the Protection Profile. As a result the threat “cloning of the functional behaviour of the Security IC on its physical and command interface” is averted by the combination of mechanisms which split into those being evaluated according to this Protection Profile (Security IC) and those being subject to the evaluation of the Security IC Embedded Software or Security IC and the corresponding personalisation process. Therefore, functional cloning is indirectly covered by the security concerns and threats described below. 64 The high-level security concerns are refined below by defining threats as required by the Common Criteria (refer to Figure 3). Note that manipulation of the TOE is only a means to threaten user data and is not a success for the attacker in itself. Public ST Lite_Ver 16.2 3 SECURITY PROBLEM DEFINITION 34/112 Figure 3 Standard Threats 65 The high-level security concern related to security service is refined below by defining threats as required by the Common Criteria (refer to Figure 4). T.RND T.Mem-Access T.Masquerade_TOE T.Open_Samples_Diff usion Figure 4 Threats related to security service 66 The Security IC Embedded Software must contribute to averting the threats: At least it must not undermine the security provided by the TOE. 67 The above security concerns are derived from considering the end-usage phase (Phase 7) since  Phase 1 and the Phases from TOE Delivery up to the end of Phase 6 are covered by assumptions and  the development and production environment starting with Phase 2 up to TOE Delivery are covered by an organisational security policy. 68 The TOE’s countermeasures are designed to avert the threats described below. Nevertheless, they may be effective in earlier phases (Phases 4 to 6). 69 The TOE is exposed to different types of influences or interactions with its outer world. Some of them may result from using the TOE only but others may also indicate an attack. The different types of influences or interactions are visualised in Figure 5. Due to the intended usage of the TOE all interactions are considered as possible. T.Malfunction T.Phys-Probing T.Leak-Forced T.Abuse-Func T.Phys-Manipulation T.Leak-Inherent Public ST Lite_Ver 16.2 3 SECURITY PROBLEM DEFINITION 35/112 Figure 5 Interactions between the TOE and its outer world 70 An interaction with the TOE can be done through the physical interfaces (Number 7 – 9 in Figure 5) which are realised using contacts and/or a contactless interface. Influences or interactions with the TOE also occur through the chip surface (Number 1 – 6 in Figure 5). In Number 1 and 6 galvanic contacts are used. In Number 2 and 5 the influence (arrow directed to the chip) or the measurement (arrow starts from the chip) does not require a contact. Number 3 and 4 refer to specific situations where the TOE and its functional behaviour is not only influenced but definite changes are made by applying mechanical, chemical and other methods (such as 1, 2). Many attacks require a prior inspection and some reverse-engineering (Number 3). This demonstrates the basic building blocks of attacks. A practical attack will use a combination of these elements. 3.2.1 Standard Threats 71 The TOE shall avert the threat “Inherent Information Leakage (T.Leak-Inherent)” as specified below. T.Leak-Inherent Inherent Information Leakage An attacker may exploit information which is leaked from the TOE during usage of the Security IC in order to disclose confidential user data as part of the assets. 72 No direct contact with the Security IC internals is required here. Leakage may occur through emanations, variations in power consumption, I/O characteristics, clock frequency, or by changes in processing time requirements. One example is the Differential Power Analysis (DPA). This leakage may be interpreted as a covert channel transmission but is more closely related to measurement of operating parameters, which may be derived either from direct (contact) measurements (Numbers 6 and 7 in Figure 5) or measurement of emanations (Number 5 in Figure 5) and can then be related to the specific operation being performed. 73 The TOE shall avert the threat “Physical Probing (T.Phys-Probing)” as specified below. Public ST Lite_Ver 16.2 3 SECURITY PROBLEM DEFINITION 36/112 T.Phys-Probing Physical Probing An attacker may perform physical probing of the TOE in order (i) to disclose user data while stored in protected memory areas, (ii) to disclose/reconstruct the user data while processed or (iii) to disclose other critical information about the operation of the TOE to enable attacks disclosing or manipulating the user data of the Composite TOE or the Security IC Embedded Software. 74 Physical probing requires direct interaction with the Security IC internals (Numbers 5 and 6 in Figure 5). Techniques commonly employed in IC failure analysis and IC reverse engineering efforts may be used. Before that hardware security mechanisms and layout characteristics need to be identified (Number 3 in Figure 5). Determination of software design including treatment of user data of the Composite TOE may also be a pre-requisite. 75 This pertains to “measurements” using galvanic contacts or any type of charge interaction whereas manipulations are considered under the threat “Physical Manipulation (T.Phys-Manipulation)”. The threats “Inherent Information Leakage (T.Leak-Inherent)” and “Forced Information Leakage (T.Leak-Forced)“ may use physical probing but require complex signal processing in addition. 76 The TOE shall avert the threat “Malfunction due to Environmental Stress (T.Malfunction)” as specified below. T.Malfunction Malfunction due to Environmental Stress An attacker may cause a malfunction of TSF or of the Security IC Embedded Software by applying environmental stress in order to (i) modify security services of the TOE or (ii) modify functions of the Security IC Embedded Software (iii) deactivate or affect security mechanisms of the TOE to enable attacks disclosing or manipulating the user data of the Composite TOE or the Security IC Embedded Software. This may be achieved by operating the Security IC outside the normal operating conditions (Numbers 1, 2 and 9 in Figure 5). 77 The modification of security services of the TOE may e.g. affect the quality of random numbers provided by the random number generator up to undetected deactivation when the random number generator does not produce random numbers and the Security IC Embedded Software gets constant values. In another case errors are introduced in executing the Security IC Embedded Software. To exploit this an attacker needs information about the functional operation, e.g. to introduce a temporary failure within a register used by the Security IC Embedded Software with light or a power glitch. 78 The TOE shall avert the threat “Physical Manipulation (T.Phys-Manipulation)” as specified below. T.Phys-Manipulation Physical Manipulation An attacker may physically modify the Security IC in order to (i) modify user data of the Composite TOE, (ii) modify the Security IC Embedded Software, (iii) modify or deactivate security services of the TOE, or (iv) modify security mechanisms of the TOE to enable attacks disclosing or manipulating the user data of the Composite TOE or the Security IC Embedded Software. 79 The modification may be achieved through techniques commonly employed in IC failure analysis (Numbers 1, 2 and 4 in Figure 5) and IC reverse engineering efforts (Number 3 in Figure 5). The modification may result in the deactivation of a security feature. Before that hardware security mechanisms and layout characteristics need to be identified. Determination of software design including treatment of Public ST Lite_Ver 16.2 3 SECURITY PROBLEM DEFINITION 37/112 user data of the Composite TOE may also be a pre-requisite. Changes of circuitry or data can be permanent or temporary. 80 In contrast to malfunctions (refer to T.Malfunction) the attacker requires gathering significant knowledge about the TOE’s internal construction here (Number 3 in Figure 5). 81 The TOE shall avert the threat “Forced Information Leakage (T.Leak-Forced)“ as specified below: T.Leak-Forced Forced Information Leakage An attacker may exploit information which is leaked from the TOE during usage of the Security IC in order to disclose confidential user data of the Composite TOE as part of the assets even if the information leakage is not inherent but caused by the attacker. 82 This threat pertains to attacks where methods described in “Malfunction due to Environmental Stress” (refer to T.Malfunction) and/or “Physical Manipulation” (refer to T.Phys-Manipulation) are used to cause leakage from signals (Numbers 5, 6, 7 and 8 in Figure 5) which normally do not contain significant information about secrets. 83 The TOE shall avert the threat “Abuse of Functionality (T.Abuse-Func)” as specified below. T.Abuse-Func Abuse of Functionality An attacker may use functions of the TOE which may not be used after TOE Delivery in order to (i) disclose or manipulate user data of the Composite TOE, (ii) manipulate (explore, bypass, deactivate or change) security services of the TOE or (iii) manipulate (explore, bypass, deactivate or change) functions of the Security IC Embedded Software or (iv) enable an attack disclosing or manipulating the the user data of the Composite TOE or the Security IC Embedded Software. 3.2.2 Threats related to security services 84 The TOE shall avert the threat “Deficiency of Random Numbers (T.RND)” as specified below. T.RND Deficiency of Random Numbers An attacker may predict or obtain information about random numbers generated by the TOE security service for instance because of a lack of entropy of the random numbers provided. An attacker may gather information about the random numbers produced by the TOE security service. Because unpredictability is the main property of random numbers this may be a problem in case they are used to generate cryptographic keys. The entropy provided by the random numbers must be appropriate for the strength of the cryptographic algorithm, the key or the cryptographic variable is used for. Here the attacker is expected to take advantage of statistical properties of the random numbers generated by the TOE. Malfunctions or premature ageing are also considered which may assist in getting information about random numbers. Public ST Lite_Ver 16.2 3 SECURITY PROBLEM DEFINITION 38/112 3.2.3 Threats related to additional TOE Specific Functionality 85 The TOE shall avert the additional threat “Memory Access Violation (T.Mem-Access)” as specified below. T.Mem-Access Memory Access Violation Parts of the IC Smartcard Embedded Software may cause security violations by accidentally or deliberately accessing restricted data (which may include code). Any restrictions are defined by the security policy of the specific application context and must be implemented by the Smartcard IC Embedded Software. Clarification: This threat does not address the proper definition and management of the security rules implemented by the Security IC Embedded Software, this being software design and correctness issue.This threat addresses the reliability of the abstract machine targeted by the software implementation. To avert the threat, the set of access rules provided by this TOE should be undefeated if operated according to the provided guidance. The threat is not realized if the Security IC Embedded Software is designed or implemented to grant access to restricted information. It is realized if an implemented access denial is granted under unexpected conditions or if the execution machinery does not effectively control a controlled access. Here the attacker is expected to (i) take advantage of flaws in the design and/or the implementation of the TOE memory access rules (refer to T.Abuse-Func but for functions available after TOE delivery), (ii) introduce flaws by forcing operational conditions (refer to T.Malfunction) and/or by physical manipulation (refer to T.Phys-Manipulation). This attacker is expected to have a high level potential of attack. 3.2.4 Threats related to Authentication of the Security IC The TOE shall avert the threat “Masquerade the TOE (T. Masquerade_TOE)” as specified below. T.Masquerade_TOE Masquerade the TOE An attacker may threaten the property being a genuine TOE by producing a chip which is not a genuine TOE but wrongly identifying itself as genuine TOE sample. The threat T.Masquerade_TOE may threaten the unique identity of the TOE as described in the P.Process- TOE or the property as being a genuine TOE without unique identity. Mitigation of masquerade requires tightening up the identification by authentication. 3.2.5 Threats related to Diffusion of open samples The TOE shall avert the threat “Diffusion of open samples(T.Open_Samples_Diffusion)” as specified below. T.Open_Samples_Diffusion Diffusion of open samples Public ST Lite_Ver 16.2 3 SECURITY PROBLEM DEFINITION 39/112 An attacker may get access to open samples of the TOE and use them to gain information about the TSF (loader, memory management unit, ROM code, …). He may also use the open samples to characterize the behavior of the IC and its security functionalities (for example: characterization of side channel profiles, perturbation cartography, …). The execution of a dedicated security features (for example: execution of a DES computation without countermeasures or by de- activating countermeasures) through the loading of an adequate code would allow this kind of characterization and the execution of enhanced attacks on the IC. 3.3 Organizational Security Policies 86 The following Figure 6 shows the policies applied in this Security Target. P.Process- TOE P.Crypto- Service P.Lim_Block_Lo ader P.Ctlr_Loader Figure 6 Policies 87 The IC Developer / Manufacturer must apply the policy “Identification during TOE Development and Production (P.Process-TOE)” as specified below. P.Process-TOE Identification during TOE Development and Production An accurate identification must be established for the TOE. This requires that each instantiation of the TOE carries this unique identification. 88 The accurate identification is introduced at the end of the production test in phase 3. Therefore the production environment must support this unique identification. 89 The information and material produced and/or processed by the TOE Manufacturer in the TOE development and production environment (Phases 2 up to TOE Delivery) can be grouped as follows:  logical design data,  physical design data,  IC Dedicated Software, Security IC Embedded Software, Initialisation Data and Pre-personalisation Data,  specific development aids,  test and characterisation related data,  material for software development support, and  photomasks and products in any form as long as they are generated, stored, or processed by the TOE Manufacturer. 90 The TOE provides specific cryptographic services which can be used by the Smartcard Embedded Software. In the following specific cryptographic services are listed which is not derived from threats identified for Public ST Lite_Ver 16.2 3 SECURITY PROBLEM DEFINITION 40/112 the TOE’s environment because it can only be decided in the context of the smartcard applications, against which threats the Smartcard Embedded Software will use the specific cryptographic service. The IC Developer / Manufacturer must apply the policy “Cryptographic Service (P.Crypto-Service)” as specified below. P.Crypto-Service Cryptographic Services provided by the TOE The TOE shall provide the following cryptographic services to the IC Embedded Software:  Triple Data Encryption Standard (TDES)  Advanced Encryption Standard (AES)  Rivest-Shamir-Adleman (RSA) public key asymmetric cryptography (optional)  Elliptic Curve Cryptography (ECC) (optional)  Secure Hash Algorithm (SHA) (optional) Note:The TOE can be delivered without the RSA/ECC/SHA crypto library. In this case the TOE does not provide the Additional Specific Security Functionality Rivest-Shamir-Adleman Cryptography and Elliptic Curve Cryptography (ECC) and Secure Hash Algorithm (SHA). The IC Developer / Manufacturer must apply the organisational security policy “Limiting and Blocking the Loader Functionality (P.Lim_Block_Loader)” applies to Loader dedicated for usage in secured environment specified below. P.Lim_Block_Loader Limiting and Blocking the Loader Functionality The composite manufacturer uses the Loader for loading of Security IC Embedded Software, user data of the Composite Product or IC Dedicated Support Software in charge of the IC Manufacturer. He limits the capability and blocks the availability of the Loader in order to protect stored data from disclosure and manipulation. The organizational security policy “Controlled usage to Loader Functionality (P.Ctlr_Loader)” applies to Loader dedicated for usage by authorized users only. P.Ctlr_Loader Controlled usage to Loader Functionality Authorized user controls the usage of the Loader functionality in order to protect stored and loaded user data from disclosure and manipulation. Public ST Lite_Ver 16.2 3 SECURITY PROBLEM DEFINITION 41/112 3.4 Assumptions 91 The following Figure 7 shows the assumptions applied in this Security Target. A.Process-Sec-IC A.Key-Function A.Resp-Appl Figure 7 Assumptions 92 The intended usage of the TOE is twofold, depending on the Life Cycle Phase: (i) The Security IC Embedded Software developer use it as a platform for the Security IC software being developed. The Composite Product Manufacturer (and the consumer) uses it as a part of the Security IC. The Composite Product is used in a terminal which supplies the Security IC (with power and clock) and (at least) mediates the communication with the Security IC Embedded Software. 93 Before being delivered to the consumer the TOE is packaged. Many attacks require the TOE to be removed from the carrier. Though this extra step adds difficulties for the attacker no specific assumptions are made here regarding the package. 94 Appropriate “Protection during Packaging, Finishing and Personalisation (A.Process-Sec-IC)” must be ensured after TOE Delivery up to the end of Phase 6, as well as during the delivery to Phase 7 as specified below. A.Process-Sec-IC Protection during Packaging, Finishing and Personalisation It is assumed that security procedures are used after delivery of the TOE by the TOE Manufacturer up to delivery to the end-consumer to maintain confidentiality and integrity of the TOE and of its manufacturing and test data (to prevent any possible copy, modification, retention, theft or unauthorised use). This means that the Phases after TOE Delivery are assumed to be protected appropriately. 95 The information and material produced and/or processed by the Security IC Embedded Software Developer in Phase 1 and by the Composite Product Manufacturer can be grouped as follows:  the Security IC Embedded Software including specifications, implementation and related documentation,  Pre-personalisation Data and Personalisation Data including specifications of formats and memory areas, test related data,  the user data of the Composite TOE and related documentation, and  material for software development support 96 as long as they are not under the control of the TOE Manufacturer. Details must be defined in the Protection Profile or Security Target for the evaluation of the Security IC Embedded Software and/or Security IC. 97 The developer of the Security IC Embedded Software must ensure the appropriate usage of Security IC while developing this software in Phase 1 as described in the (i) TOE guidance documents (refer to the Common Criteria assurance class AGD) such as the hardware data sheet, and the hardware application Public ST Lite_Ver 16.2 3 SECURITY PROBLEM DEFINITION 42/112 notes, and (ii) findings of the TOE evaluation reports relevant for the Security IC Embedded Software as documented in the certification report. 98 The Security IC Embedded Software must ensure the appropriate “Treatment of user data of the Composite TOE (A.Resp-Appl)” as specified below. A.Resp-Appl Treatment of user data of the Composite TOE All user data of the Composite TOE are owned by Security IC Embedded Software. Therefore, it must be assumed that security relevant user data of the Composite TOE (especially cryptographic keys) are treated by the Security IC Embedded Software as defined for its specific application context. 99 The application context specifies how the user data of the Composite TOE shall be handled and protected. The evaluation of the Security IC according to this Security Target is conducted on generalized application context. The concrete requirements for the Security IC Embedded Software shall be defined in the Protection Profile respective Security Target for the Security IC Embedded Software. The Security IC cannot prevent any compromise or modification of user data of the Composite TOE by malicious Security IC Embedded Software. 100 The developer of the Smartcard Embedded Software must ensure the appropriate “Usage of Key- dependent Functions (A.Key-Function)” while developing this software in Phase 1 as specified below. A.Key-Function Usage of Key-dependent Functions Key-dependent functions (if any) shall be implemented in the Smartcard Embedded Software in a way that they are not susceptible to leakage attacks (as described under T.Leak-Inherent and T.Leak-Forced). 101 Note that here the routines which may compromise keys when being executed are part of the Smartcard Embedded Software. In contrast to this the threats T.Leak-Inherent and T.Leak-Forced address (i) the cryptographic routines which are part of the TOE and (ii) the processing of User Data including cryptographic keys. Public ST Lite_Ver 16.2 4 SECURITY OBJECTIVES 43/112 4 SECURITY OBJECTIVES 102 This chapter Security Objectives contains the following sections: 4.1 Security Objectives for the TOE 4.2 Security Objectives for the Security IC Embedded Software 4.3 Security Objectives for the operational Environment 4.4 Security Objectives Rationale Public ST Lite_Ver 16.2 4 SECURITY OBJECTIVES 44/112 4.1 Security Objectives for the TOE 103 The user have the following standard high-level security goals related to the assets: SG1 maintain the integrity user data (when being executed/processed and when being stored in the TOE’s memories) as well as SG2 maintain the confidentiality of user data (when being processed and when being stored in the TOE’s protected memories). SG3 maintain the correct operation of the security services provided by the TOE for the Security IC Embedded Software. 104 Note, the Security IC may not distinguish between user data which are public known or kept confidential. Therefore the security IC shall protect the user data in integrity and in confidentiality if stored in protected memory areas, unless the Security IC Embedded Software chooses to disclose or modify it. Parts of the Security IC Embedded Software which do not contain secret data or security critical source code, may not require protection from being disclosed. Other parts of the Security IC Embedded Software may need kept confidential since specific implementation details may assist an attacker. 105 These standard high-level security goals in the context of the security problem definition build the starting point for the definition of security objectives as required by the Common Criteria (refer to Figure 8). Note that the integrity of the TOE is a means to reach these objectives. O.Abuse_Func O.Leak-Forced O.Identification O.Leak-Inherent O.Malfunction O.Phys-Probing O.Phys-Manipulation Figure 8 Standard Security Objectives 106 According to this Protection Profile there is the following high-level security goal related to specific functionality: 107 SG4 provide random numbers. 108 The additional high-level security considerations are refined below by defining security objectives as Public ST Lite_Ver 16.2 4 SECURITY OBJECTIVES 45/112 required by the Common Criteria (refer to Figure 9). Figure 9 Security Objectives related to Specific Functionality 4.1.1 Standard Security Objectives 109 The TOE shall provide “Protection against Inherent Information Leakage (O.Leak-Inherent)” as specified below. O.Leak-Inherent Protection against Inherent Information Leakage The TOE must provide protection against disclosure of confidential data (User Data or TSF data) stored and/or processed in the Smartcard IC ● by measurement and analysis of the shape and amplitude of signals (for example on the power, clock, or I/O lines) and ● by measurement and analysis of the time between events found by measuring signals (for instance on the power, clock, or I/O lines). This objective pertains to measurements with subsequent complex signal processing whereas O.Phys-Probing is about direct measurements on elements on the chip surface. Details correspond to an analysis of attack scenarios which is not given here. 110 The TOE shall provide “Protection against Physical Probing (O.Phys-Probing)” as specified below. O.Phys-Probing Protection against Physical Probing O.Cap_Avail_Loader O.Ctrl_Auth_Loader O.RND O.AES O.RSA O.ECDSA O.SHA O.Mem-Access O.Authentication O.TDES O.ECDH Public ST Lite_Ver 16.2 4 SECURITY OBJECTIVES 46/112 The TOE must provide protection against disclosure/reconstruction of user data while stored in protected memory areas and processed or against the disclosure of other critical information about the operation of the TOE. This includes protection against ● measuring through galvanic contacts which is direct physical probing on the chips surface except on pads being bonded (using standard tools for measuring voltage and current) or ● measuring not using galvanic contacts but other types of physical interaction between charges (using tools used in solid-state physics research and IC failure analysis) with a prior reverse-engineering to understand the design and its properties and functions. The TOE must be designed and fabricated so that it requires a high combination of complex equipment, knowledge, skill, and time to be able to derive detailed design information or other information which could be used to compromise security through such a physical attack. 111 The TOE shall provide “Protection against Malfunctions (O.Malfunction)” as specified below. O.Malfunction Protection against Malfunctions The TOE must ensure its correct operation. The TOE must indicate or prevent its operation outside the normal operating conditions where reliability and secure operation has not been proven or tested. This is to prevent malfunctions. Examples of environmental conditions may include voltage, clock frequency, temperature, or external energy fields. Remark: A malfunction of the TOE may also be caused using a direct interaction with elements on the chip surface. This is considered as being a manipulation (refer to the objective O.Phys-Manipulation) provided that detailed knowledge about the TOE´s internal construction is required and the attack is performed in a controlled manner. 112 The TOE shall provide “Protection against Physical Manipulation (O.Phys-Manipulation)” as specified below. O.Phys-Manipulation Protection against Physical Manipulation The TOE must provide protection against manipulation of the TOE (including its software and TSF data), the Smartcard Embedded Software and the user data of the Composite TOE. This includes protection against ● reverse-engineering (understanding the design and its properties and functions), ● manipulation of the hardware and any data, as well as ● undetected manipulation of memory contents. Public ST Lite_Ver 16.2 4 SECURITY OBJECTIVES 47/112 The TOE must be designed and fabricated so that it requires a high combination of complex equipment, knowledge, skill, and time to be able to derive detailed design information or other information which could be used to compromise security through such a physical attack. 113 The TOE shall provide “Protection against Forced Information Leakage (O.Leak-Forced)“ as specified below: O.Leak-Forced Protection against Forced Information Leakage The Security IC must be protected against disclosure of confidential data processed in the Security IC (using methods as described under O.Leak-Inherent) even if the information leakage is not inherent but caused by the attacker ● by forcing a malfunction (refer to “Protection against Malfunction due to Environmental Stress (O.Malfunction)” and/or ● by a physical manipulation (refer to “Protection against Physical Manipulation (O.Phys-Manipulation)”. If this is not the case, signals which normally do not contain significant information about secrets could become an information channel for a leakage attack. 114 The TOE shall provide “Protection against Abuse of Functionality (O.Abuse-Func)” as specified below. O.Abuse-Func Protection against Abuse of Functionality The TOE must prevent that functions of the TOE which may not be used after TOE Delivery can be abused in order to (i) disclose critical user data of the Composite TOE, (ii) manipulate critical user data of the Composite TOE, (iii) manipulate Security IC Embedded Software or (iv) bypass, deactivate, change or explore security features or security services of the TOE. Details depend, for instance, on the capabilities of the Test Features provided by the IC Dedicated Test Software which are not specified here. 115 The TOE shall provide “TOE Identification (O.Identification)“ as specified below: O.Identification TOE Identification The TOE must provide means to store Initialisation Data and Pre-personalisation Data in its non-volatile memory. The Initialisation Data (or parts of them) are used for TOE identification. 4.1.2 Security Objectives related to Specific Functionality (referring to SG4) 116 The TOE shall provide “Random Numbers (O.RND)” as specified below. O.RND Random Numbers The TOE will ensure the cryptographic quality of random number generation. For instance random numbers shall not be predictable and shall have sufficient entropy. Public ST Lite_Ver 16.2 4 SECURITY OBJECTIVES 48/112 The TOE will ensure that no information about the produced random numbers is available to an attacker since they might be used for instance to generate cryptographic keys. 4.1.3 Security Objectives for Added Function 117 The TOE shall provide “Area based Memory Access Control (O.Mem-Access)” as specified below. O.Mem-Access Area based Memory Access Control The TOE must provide the Smartcard Embedded Software with the capability to define restricted access memory areas. The TOE must then enforce the partitioning of such memory areas so that access of software to memory areas is controlled as required, for example, in a multi-application environment. 118 The TOE shall provide “Capability and availability of the Loader (O.Cap_Avail_Loader)” as specified below. O.Cap_Avail_Loader Capability and availability of the Loader The TSF provides limited capability of the Loader functionality and irreversible termination of the Loader in order to protect stored user data from disclosure and manipulation. 119 The TOE shall provide “Access control and authenticity for the Loader (O.Ctrl_Auth_Loader)” as specified below. O.Ctrl_Auth_Loader Access control and authenticity for the Loader The TSF provides trusted communication channel with authorized user, supports confidentiality protection and authentication of the user data to be loaded and access control for usage of the Loader functionality. 120 The TOE shall provide “Cryptographic service Triple-DES (O.TDES)” as specified below. O.TDES Cryptographic service Triple-DES The TOE provides secure hardware based cryptographic services implementing the Triple-DES for encryption and decryption. 121 The TOE shall provide “Cryptographic service AES (O.AES)” as specified below. O.AES Cryptographic service AES The TOE provides secure hardware based cryptographic services for the AES Public ST Lite_Ver 16.2 4 SECURITY OBJECTIVES 49/112 for encryption and decryption. 122 The TOE shall provide “Cryptographic service Hash function (O.SHA)” as specified below. O.SHA Cryptographic service Hash function The TOE provides secure software based cryptographic services for secure hash calculation. 123 The TOE shall provide “Cryptographic service Rivest-Shamir-Adleman (O.RSA)” as specified below. O.RSA Cryptographic service Rivest-Shamir-Adleman The TOE provides secure software based cryptographic services for Cryptographic operation and Cryptographic key generation. 124 The TOE shall provide “Cryptographic service Elliptic Curve DSA (O.ECDSA)” as specified below. O.ECDSA Cryptographic service Elliptic Curve DSA The TOE provides secure software based cryptographic services for Cryptographic operation and Cryptographic key generation. 125 The TOE shall provide “Cryptographic service Elliptic Curve Diffie-Hellman (O.ECDH)” as specified below. O.ECDH Cryptographic service Elliptic Curve Diffie-Hellman The TOE provides secure software based cryptographic services for Cryptographic operation. 126 The Security IC Embedded Software shall provide “Authentication to external entities (O.Authentication)” as specified below. O. Authentication Authentication to external entities The TOE shall be able to authenticate itself to external entities. The Initialisation Data (or parts of them) are used for TOE authentication verification data. 127 The TOE shall provide “Protection of the confidentiality of the TSF (O.Prot_TSF_Confidentiality)” as specified below. O.Prot_TSF_Confidentiality Protection of the confidentiality of the TSF Public ST Lite_Ver 16.2 4 SECURITY OBJECTIVES 50/112 The TOE must provide protection against disclosure of confidential operations of the Security IC (loader, memory management unit, …) through the use of a dedicated code loaded on open samples. 4.2 Security Objectives for the Security IC Embedded Software 128 The development of the Security IC Embedded Software is outside the development and manufacturing of the TOE. The Security IC Embedded Software defines the operational use of the TOE. This section describes the security objective for the Security IC Embedded Software. Note, in order to ensure that the TOE is used in a secure manner the Security IC Embedded Software shall be designed so that the requirements from the following documents are met: (i) hardware data sheet for the TOE, (ii) data sheet of the IC Dedicated Software of the TOE, (iii) TOE application notes, other guidance documents, and (iv) findings of the TOE evaluation reports relevant for the Security IC Embedded Software as referenced in the certification report. 129 The Security IC Embedded Software shall provide “Treatment of user data of the Composite TOE (OE.Resp-Appl)” as specified below. OE.Resp-Appl Treatment of user data of the Composite TOE Security relevant user data of the Composite TOE (especially cryptographic keys) are treated by the Security IC Embedded Software as required by the security needs of the specific application context. For example the Security IC Embedded Software will not disclose security relevant user data of the Composite TOE to unauthorised users or processes when communicating with a terminal. 4.2.1 Clarification of “Treatment of User Data (OE.Resp-Appl)” 130 Regarding the cryptographic services this objective of the environment has to be clarified. By definition cipher or plain text data and cryptographic keys are User Data. The Smartcard Embedded Software shall treat these data appropriately, use only proper secret keys (chosen from a large key space) as input for the cryptographic function of the TOE and use keys and functions appropriately in order to ensure the strength of cryptographic operation. 131 This means that keys are treated as confidential as soon as they are generated. The keys must be unique with a very high probability, as well as cryptographically strong. If keys are imported into the TOE and/or derived from other keys, quality and confidentiality must be maintained. This implies that appropriate key management has to be realised in the environment. 132 Regarding the area based access control this objective of the environment has to be clarified. The treatment of User Data is also required when a multi-application operating system is implemented as part of the Smartcard Embedded Software on the TOE. In this case the multi-application operating system should not disclose security relevant user data of one application to another application when it is processed or stored on the TOE. 4.3 Security Objectives for the Operational Environment TOE Delivery up to the End of Phase 6 Public ST Lite_Ver 16.2 4 SECURITY OBJECTIVES 51/112 133 Appropriate “Protection during Packaging, Finishing and Personalisation (OE.Process-Sec-IC)” must be ensured after TOE Delivery up to the end of Phases 6, as well as during the delivery to Phase 7 as specified below. OE.Process-Sec-IC Protection during composite product manufacturing Security procedures shall be used after TOE Delivery up to delivery to the "consumer" to maintain confidentiality and integrity of the TOE and of its manufacturing and test data (to prevent any possible copy, modification, retention, theft or unauthorised use). This means that Phases after TOE Delivery up to the end of Phase 6 must be protected appropriately. The operational environment of the TOE shall provide “Limitation of capability and blocking the Loader (OE.Lim_Block_Loader)” as specified below. OE.Lim_Block_Loader Limitation of capability and blocking the Loader The Composite Product Manufacturer will protect the Loader functionality against misuse, limit the capability of the Loader and terminate irreversibly the Loader after intended usage of the Loader and terminate irreversibly the Loader after intended usage of the Loader and before the end of phase 5. Note: To maintain the confidentiality of the data of the composite TOE, the intended usage of the Loader is limited to the phase 5 of the life cycle. The operational environment of the TOE shall provide “Secure communication and usage of the Loader (OE.Loader_Usage)” as specified below. OE.Loader_Usage Secure communication and usage of the Loader The authorized user must support the trusted communication channel with the TOE by confidentiality protection and authenticity proof of the data to be loaded and fulfilling the access conditions required by the Loader The operational environment shall provide “External entities authenticating of the TOE (OE.TOE_Auth)”. OE.TOE_Auth External entities authenticating of the TOE The operational environment shall support the authentication verification mechanism and know authentication reference data of the TOE. 4.3.1 Clarification of “Protection during Composite Product Manufacturing (OE.Process-Sec-IC)” 134 The protection during packaging, finishing and personalization includes also the personalization process and the personalization data during Phase 4, Phase 5 and Phase 6. 135 Since OE.Process-Sec-IC requires the Composite Product Manufacturer to implement those measures assumed in A.Process-Sec-IC, the assumption is covered by this objective. Public ST Lite_Ver 16.2 4 SECURITY OBJECTIVES 52/112 4.4 Security Objectives Rationale 136 Table 4 below gives an overview, how the assumptions, threats, and organisational security policies are addressed by the objectives. The text following after the table justifies this in detail. Assumption, Threat or Organisational Security Policy Security Objective Notes A.Resp-Appl OE.Resp-Appl Phase 1 P.Process-TOE O.Identification Phase 2 – 3 optional Phase 4 A.Process-Sec-IC OE.Process-Sec-IC Phase 5 – 6 optional Phase 4 T.Leak-Inherent O.Leak-Inherent T.Phys-Probing O.Phys-Probing T.Malfunction O.Malfunction T.Phys-Manipulation O.Phys-Manipulation T.Leak-Forced O.Leak-Forced T.Abuse-Func O.Abuse-Func T.RND O.RND T.Mem-Access O.Mem-Access P.Crypto-Service O.TDES O.AES O.RSA O.ECDSA O.ECDH O.SHA A.Key-Function OE.Resp-Appl P.Lim_Block_Loader O.Cap_Avail_Loader OE.Lim_Block_Loader Phase 5 P.Ctlr_Loader O.Ctrl_Auth_Loader OE.Loader_Usage Phase 5 T.Masquerade_TOE O.Authentication OE.TOE_Auth T.Open_Samples_Diffusion O.Prot_TSF_Confidentia lity O.Leak-Inherent O.Leak-Forced Phase 4, 5 Table 2 Security Objectives versus Assumptions, Threats or Policies Public ST Lite_Ver 16.2 4 SECURITY OBJECTIVES 53/112 137 The justification related to the assumption “Treatment of user data of the Composite TOE (A.Resp-Appl)” is as follows: 138 Since OE.Resp-Appl requires the Security IC Embedded Software to implement measures as assumed in A.Resp-Appl, the assumption is covered by the objective. 139 The justification related to the organisational security policy “Protection during TOE Development and Production (P.Process-TOE)” is as follows: 140 O.Identification requires that the TOE has to support the possibility of a unique identification. The unique identification can be stored on the TOE. Since the unique identification is generated by the production environment the production environment must support the integrity of the generated unique identification. The technical and organisational security measures that ensure the security of the development environment and production environment are evaluated based on the assurance measures that are part of the evaluation. For a list of material produced and processed by the TOE Manufacturer refer to paragraph 44. All listed items and the associated development and production environments are subject of the evaluation. Therefore, the organisational security policy P.Process-TOE is covered by this objective, as far as organisational measures are concerned. 141 The justification related to the assumption “Protection during Packaging, Finishing and Personalisation (A.Process-Sec-IC)” is as follows: 142 Since OE.Process-Sec-IC requires the Composite Product Manufacturer to implement those measures assumed in A.Process-Sec-IC, the assumption is covered by this objective. 143 The justification related to the threats “Inherent Information Leakage (T.Leak-Inherent)”, “Physical Probing (T.Phys-Probing)”, “Malfunction due to Environmental Stress (T.Malfunction)”, “Physical Manipulation (T.Phys-Manipulation)”, “Forced Information Leakage (T.Leak-Forced)“, “Abuse of Functionality (T.Abuse- Func)” and “Deficiency of Random Numbers (T.RND)” is as follows: 144 For all threats the corresponding objectives are stated in a way, which directly corresponds to the description of the threat. It is clear from the description of each objective, that the corresponding threat is removed if the objective is valid. More specifically, in every case the ability to use the attack method successfully is countered, if the objective holds. 145 The justification related to the threat “Memory Access Violation (T.Mem-Access)” is as follows: 146 According to O.Mem-Access the TOE must enforce the partitioning of memory areas so that access of software to memory areas is controlled. Any restrictions are to be defined by the Smartcard Embedded Software. Thereby security violations caused by accidental or deliberate access to restricted data (which may include code) can be prevented (refer to T.Mem-Access). The threat T.Mem-Access is therefore removed if the objective is met. 147 The clarification of O.Mem-Access makes clear that it is up to the Smartcard Embedded Software to implement the memory management scheme by appropriately administrating the TSF. The TOE shall provide access control functions as a means to be used by the Smartcard Embedded Software. This is further emphasised by the clarification of Treatment of User Data (OE.Resp-Appl) which reminds that the Smartcard Embedded Software must not undermine the restrictions it defines. Therefore, the clarifications contribute to the coverage of the threat T.Mem-Access. . 148 Compared to Smartcard IC Platform Protection Profile a clarification has been made for the security objective “Treatment of User Data (OE.Resp-Appl)”: By definition cipher or plain text data and cryptographic keys are User Data. So, the Smartcard Embedded Software will protect such data if required Public ST Lite_Ver 16.2 4 SECURITY OBJECTIVES 54/112 and use keys and functions appropriately in order to ensure the strength of cryptographic operation. Quality and confidentiality must be maintained for keys that are imported and/or derived from other keys. This implies that appropriate key management has to be realised in the environment. That is expressed by the assumption A.Key—Function which is covered from OE.Resp–Appl. These measures make sure that the assumption A.Resp-Appl is still covered by the security objective OE.Resp-Appl. 149 The organisational security policy Limitation of capability and blocking the Loader (P.Lim_Block_Loader) is directly implemented by the security objective for the TOE “Capability and availability of the Loader (O.Cap_Avail_Loader)” and the security objective for the TOE environment “Limitation of capability and blocking the Loader (OE.Lim_Block_Loader)”. The TOE security objective “Capability and availability of the Loader” (O.Cap_Avail_Loader)” mitigates also the threat “Abuse of Functionality “ (T.Abuse-Func) if attacker tries to misuse the Loader functionality in order to manipulate security services of the TOE provided or depending on IC Dedicated Support Software or user data of the TOE as IC Embedded Software, TSF data or user data of the smartcard product. 150 The organisational security policy “Controlled usage to Loader Functionality (P.Ctlr_Loader) is directly implemented by the security objective for the TOE “Access control and authenticity for the Loader (O.Ctrl_Auth_Loader)” and the security objective for the TOE environment “Secure communication and usage of the Loader (OE.Loader_Usage)”. 151 The threat “Masquerade the TOE (T.Masquerade_TOE)” is directly covered by the TOE security objective “Authentication to external entities (O.Authentication)” describing the proving part of the authentication and the security objective for the operational environment of the TOE “External entities authenticating of the TOE (OE.TOE_Auth)” the verifying part of the authentication. 152 The justification related to the security objectives O.TDES, O.AES, O.RSA, O.ECDSA, O.ECDH and O.SHA is followings: Since these objectives require the TOE to implement the same specific security functionality as required by P.Crypto-Service, the organization security policy is covered by the objective. 153 The threat “Diffusion of open samples(T.Open_Samples_Diffusion)” is directly covered by the TOE security objective “Protection of the confidentiality of the TSF (O.Prot_TSF_Confidentiality)”, “Protection against Inherent Information Leakage (O.Leak-Inherent)” and “Protection against Forced Information Leakage (O.Leak-Forced)”the verifying part of the authentication. describing the proving part of the authentication. 154 The threat “Diffusion of open samples” (T.Open_Samples_Diffusion) is directly covered by the TOE security objective “Protection of the confidentiality of the TSF” (O.Prot_TSF_Confidentiality) based on the self-protection of the TOE and the authentication mechanism of the Loader. Additionally to O.Prot_TSF_Confidentiality (Protection of the confidentiality of the TSF), T.Open_Samples_Diffusion threat is countered by O.Leak-Inherent (Protection against Inherent Information Leakage) and O.Leak-Forced (Protection against Forced Information Leakage) from the PP. Public ST Lite_Ver 16.2 5 EXTENDED COMPONENTS DEFINITION 55/112 5 EXTENDED COMPONENTS DEFINITION 155 This chapter 5 Extended Components Definition contains the following sections: 5.1 Definition of the family FCS_RNG 5.2 Definition of the Family FMT_LIM 5.3 Definition of the Family FAU_SAS 5.4 Definition of the Family FDP_SDC 5.5 Definition of the Family FIA_API Public ST Lite_Ver 16.2 5 EXTENDED COMPONENTS DEFINITION 56/112 5.1 Definition of the Family FCS_RNG 156 To define the IT security functional requirements of the TOE an additional family (FCS_RNG) of the Class FCS (cryptographic support) is defined here. This family describes the functional requirements for random number generation used for cryptographic purposes. FCS_RNG Generation of Random Numbers 157 Family behaviour 158 This family defines quality requirements for the generation of random numbers which are intended to be used for cryptographic purposes. 159 Component levelling: FCS_RNG.1 Generation of random numbers requires that random numbers meet a defined quality metric. Management: FCS_RNG.1 There are no management activities foreseen. Audit: FCS_RNG.1 There are no actions defined to be auditable. FCS_RNG.1 Random number generation Hierarchical to: No other components. Dependencies: No dependencies. FCS_RNG.1.1 The TSF shall provide a [selection: physical, non-physical true, deterministic, hybrid physical, hybrid deterministic] random number generator that implements: [assignment: list of security capabilities]. FCS_RNG.1.2 The TSF shall provide [selection: bits, octets of bits, numbers [assignment: format of the numbers]] that meet [assignment: a defined quality metric]. Public ST Lite_Ver 16.2 5 EXTENDED COMPONENTS DEFINITION 57/112 5.2 Definition of the Family FMT_LIM 160 To define the IT security functional requirements of the TOE an additional family (FMT_LIM) of the Class FMT (Security Management) is defined here. This family describes the functional requirements for the Test Features of the TOE. The new functional requirements were defined in the class FMT because this class addresses the management of functions of the TSF. The examples of the technical mechanism used in the TOE appropriate to address the specific issues of preventing the abuse of functions by limiting the capabilities of the functions and by limiting their availability. 161 The family “Limited capabilities and availability (FMT_LIM)” is specified as follows. FMT_LIM Limited capabilities and availability Family behaviour This family defines requirements that limit the capabilities and availability of functions in a combined manner. Note that FDP_ACF restricts the access to functions whereas the component Limited Capability of this family requires the functions themselves to be designed in a specific manner. Component levelling: FMT_LIM.1 Limited capabilities requires that the TSF is built to provide only the capabilities (perform action, gather information) necessary for its genuine purpose. FMT_LIM.2 Limited availability requires that the TSF restrict the use of functions (refer to Limited capabilities (FMT_LIM.1)). This can be achieved, for instance, by removing or by disabling functions in a specific phase of the TOE’s life-cycle. Management: FMT_LIM.1, FMT_LIM.2 There are no management activities foreseen. Audit: FMT_LIM.1, FMT_LIM.2 There are no actions defined to be auditable. 162 The TOE Functional Requirement “Limited capabilities (FMT_LIM.1)” is specified as follows. FMT_LIM.1 Limited capabilities Hierarchical to: No other components. FMT_LIM.1.1 The TSF shall be designed and implemented in a manner that limits their Public ST Lite_Ver 16.2 5 EXTENDED COMPONENTS DEFINITION 58/112 capabilities so that in conjunction with “Limited availability (FMT_LIM.2)” the following policy is enforced [assignment: Limited capability policy]. Dependencies: FMT_LIM.2 Limited availability. 163 The TOE Functional Requirement “Limited availability (FMT_LIM.2)” is specified as follows. FMT_LIM.2 Limited availability Hierarchical to: No other components. FMT_LIM.2.1 The TSF shall be designed in a manner that limits its availability so that in conjunction with “Limited capabilities (FMT_LIM.1)” the following policy is enforced [assignment: Limited availability policy]. Dependencies: FMT_LIM.1 Limited capabilities. 164 Application note: The functional requirements FMT_LIM.1 and FMT_LIM.2 assume that there are two types of mechanisms (limitation of capabilities and limitation of availability) which together shall provide protection in order to enforce the same policy or two mutual supportive policies related to the same functionality. This allows e.g. that (i) the TSF is provided without restrictions in the product in its user environment but its capabilities are so limited that the policy is enforced or conversely (ii) the TSF is designed with high functionality but is removed or disabled in the product in its user environment. The combination of both requirements shall enforce the policy. Public ST Lite_Ver 16.2 5 EXTENDED COMPONENTS DEFINITION 59/112 5.3 Definition of the Family FAU_SAS 165 To define the security functional requirements of the TOE an additional family (FAU_SAS) of the Class FAU (Security Audit) is defined here. This family describes the functional requirements for the storage of audit data. It has a more general approach than FAU_GEN, because it does not necessarily require the data to be generated by the TOE itself and because it does not give specific details of the content of the audit records. 166 The family “Audit data storage (FAU_SAS)” is specified as follows. FAU_SAS Audit data storage Family behaviour This family defines functional requirements for the storage of audit data. Component levelling FAU_SAS.1 Requires the TOE to provide the possibility to store audit data. Management: FAU_SAS.1 There are no management activities foreseen. Audit: FAU_SAS.1 There are no actions defined to be auditable. FAU_SAS.1 Audit storage Hierarchical to: No other components. FAU_SAS.1.1 The TSF shall provide [assignment: list of subjects] with the capability to store [assignment: list of audit information] in the [assignment: type of persistent memory]. Dependencies: No dependencies. Public ST Lite_Ver 16.2 5 EXTENDED COMPONENTS DEFINITION 60/112 5.4 Definition of the Family FDP_SDC 167 To define the security functional requirements of the TOE an additional family (FDP_SDC.1) of the Class FDP (User data protection) is defined here. The family “Stored data confidentiality (FDP_SDC)” is specified as follows. FDP_SDC.1 Stored data confidentiality Family behavior This family provides requirements that address protection of user data confidentiality while these data are stored within memory areas protected by the TSF. The TSF provides access to the data in the memory through the specified interfaces only and prevents compromise of their information bypassing these interfaces. It complements the family “Stored data integrity (FDP_SDI)” which protects the user data from integrity errors while being stored in the memory. Component leveling 168 FDP_SDC.1 Requires the TOE to protect the confidentiality of information of the user data in specified memory areas. Management: FDP_SDC.1. There are no management activities foreseen. Audit: FDP_SDC.1 There are no actions defined to be auditable. FDP_SDC.1 Stored data confidentiality Hierarchical to: No other components. Public ST Lite_Ver 16.2 5 EXTENDED COMPONENTS DEFINITION 61/112 Dependencies: No dependencies. FDP_SDC.1.1 The TSF shall ensure the confidentiality of the information of the user data while it is stored in the [assignment: memory area] 5.5 Definition of the Family FIA_API 169 To describe the IT security functional requirements of the TOE a functional family FIA_API (Authentication Proof of Identity) of the Class FIA (Identification and authentication) is defined here. This family describes the functional requirements for the proof of the claimed identity by the TOE and enables the authentication verification by an external entity. The other families of the class FIA address the verification of the identity of an external entity by the TOE. 170 The other families of the Class FIA describe only the authentication verification of users’ identity performed by the TOE and do not describe the functionality of the user to prove their identity. The following paragraph defines the family FIA_API in the style of the Common Criteria part 2 (cf. [3], chapter “Extended components definition (APE_ECD)”) from a TOE point of view. 171 The family “Authentication Proof of Identity (FIA_API)” is specified as follows. FIA_API.1 Authentication Proof of Identity Family behaviour 172 This family defines functions provided by the TOE to prove its identity and to be verified by an external entity in the TOE IT environment. Component levelling FIA_API.1 Authentication Proof of Identity, provides proof of the identity of the TOE, an object or an authorized user or role to an external entity. Management: FIA_API.1 The following actions could be considered for the management functions in FMT: Management of authentication information used to prove the claimed identity. Audit: FIA_API.1 There are no actions defined to be auditable. FIA_API.1 Authentication Proof of Identity Hierarchical to: No other components. Dependencies: No dependencies. Public ST Lite_Ver 16.2 5 EXTENDED COMPONENTS DEFINITION 62/112 FIA_API.1.1 The TSF shall provide a [assignment: authentication mechanism] to prove the identity of the [selection: TOE, [assignment: object, authorized user or role]] to an external entity. Public ST Lite_Ver 16.2 6 IT security requirements 63/112 6 IT security requirements 173 This chapter 6 IT Security Requirements contains the following sections: 6.1 Security Functional Requirements for the TOE 6.2 Security Assurance Requirements for the TOE 6.3 Security Requirements Rationale Public ST Lite_Ver 16.2 6 IT security requirements 64/112 6.1 Security Functional Requirements for the TOE 174 In order to define the Security Functional Requirements the Part 2 of the Common Criteria was used. However, some Security Functional Requirements have been refined. The refinements are described below the associated SFR. The operations completed in the ST are marked in italic font. 6.1.1 Malfunctions 175 The TOE shall meet the requirement “Limited fault tolerance (FRU_FLT.2)” as specified below. FRU_FLT.2 Limited fault tolerance Hierarchical to: FRU_FLT.1 Degraded fault tolerance FRU_FLT.2.1 The TSF shall ensure the operation of all the TOE’s capabilities when the following failures occur: exposure to operating conditions which are not detected according to the requirement Failure with preservation of secure state (FPT_FLS.1). Dependencies: FPT_FLS.1 Failure with preservation of secure state Refinement: The term “failure” above means “circumstances”. The TOE prevents failures for the “circumstances” defined above. 176 The TOE shall meet the requirement “Failure with preservation of secure state (FPT_FLS.1)” as specified below. FPT_FLS.1 Failure with preservation of secure state Hierarchical to: No other components. FPT_FLS.1.1 The TSF shall preserve a secure state when the following types of failures occur: exposure to operating conditions which may not be tolerated according to the requirement Limited fault tolerance (FRU_FLT.2) and where therefore a malfunction could occur. Dependencies: No dependencies Refinement: The term “failure” above also covers “circumstances”. The TOE prevents failures for the “circumstances” defined above. Application note: The secure state is maintained by TOE’s detectors. The TOE’s detectors are monitoring the failure occurs. The failures are abnormal detectors that detect out of the specified range. If the failures happen, the TOE goes into secure state. This satisfies the FPT_FLS.1 “Failure with preservation of secure state.” 6.1.2 Abuse of Functionality 177 The TOE shall meet the requirement “Limited capabilities (FMT_LIM.1)” as specified below (Common Criteria Part 2 extended). FMT_LIM.1 Limited capabilities Hierarchical to: No other components. Public ST Lite_Ver 16.2 6 IT security requirements 65/112 FMT_LIM.1.1 The TSF shall be designed and implemented in a manner that limits their capabilities so that in conjunction with “Limited availability (FMT_LIM.2)” the following policy is enforced: Deploying Test Features after TOE Delivery does not allow user data of the Composite TOE to be disclosed or manipulated, TSF data to be disclosed or manipulated, software to be reconstructed and no substantial information about construction of TSF to be gathered which may enable other attacks. Dependencies: FMT_LIM.2 Limited availability. 178 The TOE shall meet the requirement “Limited availability (FMT_LIM.2)” as specified below (Common Criteria Part 2 extended). FMT_LIM.2 Limited availability Hierarchical to: No other components. FMT_LIM.2.1 The TSF shall be designed in a manner that limits their availability so that in conjunction with “Limited capabilities (FMT_LIM.1)” the following policy is enforced: Deploying Test Features after TOE Delivery does not allow user data of the Composite TOE to be disclosed or manipulated, TSF data to be disclosed or manipulated, software to be reconstructed and no substantial information about construction of TSF to be gathered which may enable other attacks. Dependencies: FMT_LIM.1 Limited capabilities. 179 The TOE shall meet the requirement “Audit storage (FAU_SAS.1)” as specified below (Common Criteria Part 2 extended). FAU_SAS.1 Audit storage Hierarchical to: No other components. FAU_SAS.1.1 The TSF shall provide the test process before TOE Delivery with the capability to store the Initialisation Data and/or Prepersonalisation Data and/or supplements of the Smartcard Embedded Software in the Test ROM area. Dependencies: No dependencies. Application Note: The integrity and uniqueness of the unique identification of the TOE must be supported by the development, production and test environment. 6.1.3 Physical Manipulation and Probing 180 The TOE shall meet the requirement “Stored data confidentiality (FDP_SDC.1)” as specified below. FDP_SDC.1 Stored data confidentiality Hierarchical to: No other components. Dependencies: No dependencies. FDP_SDC.1.1 The TSF shall ensure the confidentiality of the information of the user data while it is stored in the FLASH, RAM or ROM. Public ST Lite_Ver 16.2 6 IT security requirements 66/112 181 The TOE shall meet the requirement “Stored data integrity monitoring and action (FDP_SDI.2)” as specified below. FDP_SDI.2 Stored data integrity monitoring and action Hierarchical to: No other components. Dependencies: No dependencies. FDP_SDI.2.1 The TSF shall monitor user data stored in containers controlled by the TSF for error on all objects, based on the following attributes: FLASH, RAM or ROM read operation. FDP_SDI.2.2 Upon detection of a data integrity error, the TSF shall enforce a device RESET or an interrupt. Application Note: This requirement is achieved by security features such internal encryption and scrambling mechanisms. 182 The TOE shall meet the requirement “Resistance to physical attack (FPT_PHP.3)” as specified below. FPT_PHP.3 Resistance to physical attack Hierarchical to: No other components. FPT_PHP.3.1 The TSF shall resist physical manipulation and physical probing to the TSF by responding automatically such that the SFRs are always enforced. Dependencies: No dependencies. Refinement: The TSF will implement appropriate mechanisms to continuously counter physical manipulation and physical probing. Due to the nature of these attacks (especially manipulation) the TSF can by no means detect attacks on all of its elements. Therefore, permanent protection against these attacks is required ensuring that security functional requirements are enforced. Hence, “automatic response” means here (i) assuming that there might be an attack at any time and (ii) countermeasures are provided at any time. Application Note: This requirement is achieved by security feature as the shield must be removed and bypassed in order to perform physical intrusive attacks. The TOE makes appropriate secure reaction to stop operation if a physical manipulation or physical probing attack is detected. And also internal scrambling & encryption for memories and logic area make the reverse-engineering of the TOE layout unpractical. So these functionalities meet the security functional requirement of FPT_PHP.3: Resistance to physical attack Public ST Lite_Ver 16.2 6 IT security requirements 67/112 6.1.4 Leakage 183 The TOE shall meet the requirement “Basic internal transfer protection (FDP_ITT.1)” as specified below. FDP_ITT.1 Basic internal transfer protection Hierarchical to: No other components. FDP_ITT.1.1 The TSF shall enforce the Data Processing Policy to prevent the disclosure of user data when it is transmitted between physically-separated parts of the TOE. Dependencies: [FDP_ACC.1 Subset access control, or FDP_IFC.1 Subset information flow control] Refinement: The different memories, the CPU and other functional units of the TOE (e.g. a cryptographic co-processor) are seen as physically-separated parts of the TOE. 184 The TOE shall meet the requirement “Basic internal TSF data transfer protection (FPT_ITT.1)” as specified below. FPT_ITT.1 Basic internal TSF data transfer protection Hierarchical to: No other components. FPT_ITT.1.1 The TSF shall protect TSF data from disclosure when it is transmitted between separate parts of the TOE. Dependencies: No dependencies. Refinement: The different memories, the CPU and other functional units of the TOE (e.g. a cryptographic co-processor) are seen as separated parts of the TOE. This requirement is equivalent to FDP_ITT.1 above but refers to TSF data instead of user data. Therefore, it should be understood as to refer to the same Data Processing Policy defined under FDP_IFC.1 below. 185 The TOE shall meet the requirement “Subset information flow control (FDP_IFC.1)”as specified below: FDP_IFC.1 Subset information flow control Hierarchical to: No other components. FDP_IFC.1.1 The TSF shall enforce the Data Processing Policy on all confidential data when they are processed or transferred by the TOE or by the Security IC Embedded Software. Dependencies: FDP_IFF.1 Simple security attributes 186 The following Security Function Policy (SFP) Data Processing Policy is defined for the requirement “Subset information flow control (FDP_IFC.1)”: User data of the Composite TOE and TSF data shall not be accessible from the TOE except when the Security IC Embedded Software decides to communicate the User data of the Composite TOE via an external interface. The protection shall be applied to confidential data only but without the distinction of attributes controlled by the Security IC Embedded Software. Public ST Lite_Ver 16.2 6 IT security requirements 68/112 6.1.5 Random Numbers (DTRNG FRO) The TOE shall meet the requirement “Quality metric for random numbers (FCS_RNG.1)” as specified below (Common Criteria Part 2 extended). FCS_RNG.1/P2High Random number generation – AIS31 P2-High Hierarchical to: No other components. FCS_RNG.1.1/P2High The TSF shall provide a physical random number generator that implements total-failure and online tests of the random source. FCS_RNG.1.2/P2High The TSF shall provide 16-bit random numbers generated by a physical random number generator (referred to as DTRNG FRO) coupled with Von-Neumann post- processing mechanism that meets AIS31 version 3.1 Functional Classes and Evaluation Methodology for Physical Random Number Generators, 25 September 2001, Class P2-High (German metric). Dependencies: No dependencies. Application Note: The DTRNG FRO library comprises of functions that perform statistical tests on the DTRNG FRO output in order to check if DTRNG FRO hardware is working properly. If test fails the function returns an error value and the DTRNG FRO is shutdown. Those functions are described in DTRNG FRO Application note. FCS_RNG.1/RGS_B1 Random number generation – RGS_B1 Hierarchical to: No other components. FCS_RNG.1.1/RGS_B1 The TSF shall provide a physical random number generator that implements - the rules RègleArchiGVA-1 and the recommendation RecomArchiGVA-1 of [25] ; - total failure tests and online tests. FCS_RNG.1.2/RGS_B1 The TSF shall provide random numbers that meet the rule RègleArchiGVA-2 of [25]. Dependencies: No dependencies. Warning: The TSF fulfils some but not all the necessary rules to comply with [21] regardingrandom numbers generators (RNG). The composite product's RNG will comply with [21] only when all the rules of §2.4 "Génération d'aléa cryptographique" of [21] are addressed. In particular, a cryptographic post- processing must be implemented by the composite developer. Public ST Lite_Ver 16.2 6 IT security requirements 69/112 6.1.6 Alternative Random Numbers (EHP DTRNG FRO) 187 The TOE shall meet the requirement “Quality metric for random numbers (FCS_RNG.1)” as specified below (Common Criteria Part 2 extended). FCS_RNG.1/EHP Random number generation (alternative) Hierarchical to: No other components. FCS_RNG.1.1/EHP The TSF shall provide a physical true random number generator that implements: (RNG.2.1) A health test that detects severe degradation of entropy source. When the health test fails, RNG must not be used. (RNG.2.2) A test that detects malfunction in RNG system including post- processing mechanism, control logic, etc. If problem is detected, no random number is generated. FCS_RNG.1.2/EHP The TSF shall provide random numbers that meet: (RNG.2.3) Generated random numbers shall pass AIS31 statistical tests (Test Procedure A). Application Note: The EHP DTRNG FRO library comprises some functions that perform statistical tests on the DTRNG FRO output in order to execute so-called health test. If health test fails, the function returns an error value and the DTRNG FRO is shut down. The library also provides a function to generate random numbers for user applications. This function also checks if there is any malfunction in the post- processing mechanism or potential fault attacks. If that is the case, DTRNG FRO is turned off and no random numbers will be returned. Those functions are described in EHP DTRNG FRO Application note in detail and are available to embedded software. Dependencies: No dependencies 6.1.7 Memory Access Control 188 Usage of multiple applications in one Smartcard often requires separating code and data in order to prevent that one application can access code and/or data of another application. To support the TOE provides Area based Memory Access Control. 189 The security service being provided is described in the Security Function Policy (SFP) Memory Access Control Policy. The security functional requirement “Subset access control (FDP_ACC.1)” requires that this policy is in place and defines the scope were it applies. The security functional requirement “Security attribute based access control (FDP_ACF.1)” defines addresses security attribute usage and characteristics of policies. It describes the rules for the function that implements the Security Function Policy (SFP) as identified in FDP_ACC.1. The decision whether an access is permitted or not is taken based upon attributes allocated to the software. The user software defines the attributes and memory areas. The corresponding permission control information is evaluated “on-the-fly” by the hardware so that access is granted/effective or denied/inoperable. Public ST Lite_Ver 16.2 6 IT security requirements 70/112 190 The security functional requirement “Static attribute initialization (FMT_MSA.3)” ensures that the default values of security attributes are appropriately either permissive or restrictive in nature. Alternative values can be specified by any subject provided that the Memory Access Control Policy allows that. This is described by the security functional requirement “Management of security attributes (FMT_MSA.1)”. The attributes are determined during TOE manufacturing (FMT_MSA.3) or set at run-time (FMT_MSA.1). 191 From TOE´s point of view the different roles in the user software can be distinguished according to the memory based access control. However the definition of the roles belongs to the user software. 192 The following Security Function Policy (SFP) Memory Access Control Policy is defined for the requirement “Security attribute based access control (FDP_ACF.1)”: Memory Access Control Policy The TOE shall control read, write, delete, and execute accesses of software running at between two different modes (privilege and user mode) on data including code stored in memory areas. The TOE shall restrict the ability to define, to change or at least to finally accept the applied rules (as mentioned in FDP_ACF.1) to software running at privilege mode. 193 The TOE shall meet the requirement “Subset access control (FDP_ACC.1)” as specified below. FDP_ACC.1 Subset access control Hierarchical to: No other components. FDP_ACC.1.1 The TSF shall enforce the Memory Access Control Policy on all subjects (software with privilege mode and user mode), all objects (data including code stored in memories) and all the operations defined in the Memory Access Control Policy. Subjects are software codes in Privilege and User mode. Objects are data stored in ROM, RAM and FLASH memories. Dependencies: FDP_ACF.1 Security attribute based access control The TOE shall meet the requirement “Security attribute based access control (FDP_ACF.1)” as specified below. FDP_ACF.1 Security attribute based access control The attributes are all the operations related to the data stored in memories, which are the read, write and execute operations. Hierarchical to: No other components. FDP_ACF.1.1 The TSF shall enforce the Memory Access Control Policy to objects based on the following: memory area where the software is executed from and/or the memory area where the access is performed to and/or the operation to be performed. Public ST Lite_Ver 16.2 6 IT security requirements 71/112 FDP_ACF.1.2 The TSF shall enforce the following rules to determine if an operation among controlled subjects and controlled objects is allowed: evaluate the corresponding permission control information before the access so that accesses to be denied cannot be utilised by the subject attempting to perform the operation. FDP_ACF.1.3 The TSF shall explicitly authorise access of subjects to objects based on the following additional rules: none. FDP_ACF.1.4 The TSF shall explicitly deny access of subjects to objects based on the following additional rules: none. Dependencies: FDP_ACC.1 Subset access control FMT_MSA.3 Static attribute initialisation The TOE shall meet the requirement “Static attribute initialisation (FMT_MSA.3)” as specified below. FMT_MSA.3 Static attribute initialisation Hierarchical to: No other components. FMT_MSA.3.1 The TSF shall enforce the Memory Access Control Policy to provide well defined default values for security attributes that are used to enforce the SFP. FMT_MSA.3.2 The TSF shall allow any subject (provided that the Memory Access Control Policy is enforced and the necessary access is therefore allowed) to specify alternative initial values to override the default values when an object or information is created. Dependencies: FMT_MSA.1 Management of security attributes FMT_SMR.1 Security roles 194 The TOE shall meet the requirement “Management of security attributes (FMT_MSA.1)” as specified below: FMT_MSA.1 Management of security attributes Hierarchical to: No other components. FMT_MSA.1.1 The TSF shall enforce the Memory Access Control Policy to restrict the ability to change default, modify or delete the security attributes permission control information to running at privilege mode. Dependencies: [FDP_ACC.1 Subset access control or FDP_IFC.1 Subset information flow control] FMT_SMF.1 Specification of management functions FMT_SMR.1 Security roles 195 The TOE shall meet the requirement “Specification of management functions (FMT_SMF.1)” as specified below: FMT_SMF.1 Specification of management functions Hierarchical to: No other components Public ST Lite_Ver 16.2 6 IT security requirements 72/112 FMT_SMF.1.1 The TSF shall be capable of performing the following security management functions: access the control registers of the MPU. Dependencies: No dependencies 6.1.8 Cryptographic Support 196 FCS_COP.1 Cryptographic operation requires, a cryptographic operation to be performed in accordance with a specified algorithm and with a cryptographic key of specified sizes. The specified algorithm and cryptographic key sizes can be based on an assigned standard. 197 The following additional specific security functionality is implemented in the TOE:  Triple Data Encryption Standard (TDES) with 112bit or 168bit key size  Advanced Encryption Standard (AES) with 128 bit, 192bit and 256bit key size  Rivest-Shamir-Adleman (RSA) public key asymmetric cryptography, with key size 1280-bit up to 2048-bit with a granularity of 2 bits (optional)  Elliptic Curve Cryptography (ECC) (optional)  Secure Hash Algorithm (SHA) (optional) 6.1.9 Triple-DES Operation 198 The Triple DES (TDES) operation of the TOE shall meet the requirement “Cryptographic operation (FCS_COP.1)” as specified below. FCS_COP.1/TDES Cryptographic operation – TDES Hierarchical to: No other components. FCS_COP.1.1/TDES The TSF shall perform encryption and decryption in accordance with a specified cryptographic algorithm TDES in ECB mode and cryptographic key sizes 112 bit, 168 bit that meet the following: [NIST SP 800-67] chapter 2 and 3, [NIST SP 800- 38A]. Dependencies: [FDP_ITC.1 Import of user data without security attributes or FDP_ITC.2 Import of user data with security attributes, or FCS_CKM.1 Cryptographic key generation] FCS_CKM.4 Cryptographic key destruction Application Note: The TOE implements TDES with key option 1 and 2 with ECB mode. 199 The TOE shall meet the requirement “Cryptographic key destruction – TDES FCS_CKM.4/TDES)” as specified below. FCS_CKM.4/TDES Cryptographic Key destruction – TDES Hierarchical to: No other components. FCS_CKM.4.1/TDES The TSF shall destroy cryptographic keys in accordance with a specified Public ST Lite_Ver 16.2 6 IT security requirements 73/112 cryptographic key destruction method overwriting that meets the following: none. Dependencies: [FDP_ITC.1 Import of user data without security attributes, or FDP_ITC.2 Import of user data with security attributes, or FCS_CKM.1 Cryptographic key generation] Application Note The cryptographic key destruction can be done by overwriting the internal stored key or by TOE reset. 6.1.10 AES Operation 200 The AES operation of the TOE shall meet the requirement “Cryptographic operation (FCS_COP.1)” as specified below. FCS_COP.1/AES Cryptographic operation – AES Hierarchical to: No other components. FCS_COP.1.1/AES The TSF shall perform decryption and encryption in accordance with a specified cryptographic algorithm AES in ECB mode and cryptographic key sizes 128 bit, 192 bit, 256 bit that meet the following: [FIPS 197] chapter 5, [NIST SP 800-38A]. Dependencies: [FDP_ITC.1 Import of user data without security attributes or FDP_ITC.2 Import of user data with security attributes or FCS_CKM.1 Cryptographic key generation] FCS_CKM.4 Cryptographic key destruction 201 The TOE shall meet the requirement “Cryptographic key destruction (FCS_CKM.4)” as specified below. FCS_CKM.4/AES Cryptographic key destruction Hierarchical to: No other components. FCS_CKM.4.1/AES The TSF shall destroy cryptographic keys in accordance with a specified cryptographic key destruction method overwriting that meets the following: none. Dependencies: [FDP_ITC.1 Import of user data without security attributes, or FDP_ITC.2 Import of user data with security attributes, or FCS_CKM.1 Cryptographic key generation] Application Note The cryptographic key destruction can be done by overwriting the internal stored key or by TOE reset. Public ST Lite_Ver 16.2 6 IT security requirements 74/112 6.1.11 Rivest-Shamir-Adleman (RSA) Operation (optional) 202 The RSA/ECC/SHA cryptographic library of the TOE shall meet the requirement “Cryptographic operation (FCS_COP.1)” as specified below. FCS_COP.1/RSA Cryptographic operation Hierarchical to: No other components FCS_COP.1.1/RSA The TSF shall perform the modular exponentiation part of RSA signature generation and verification in accordance with a specified cryptographic algorithm Rivest-Shamir- Adleman (RSA:standard RSA and RSA-CRT) and cryptographic key sizes from 1280- bit up to 2048-bit with 2-bit granularity that meet the following standard: [ISO/IEC14888-2:2008]] section 6.2 and 6.3. Dependencies: [FDP_ITC.1 Import of user data without security attributes or FDP_ITC.2 Import of user data with security attributes, or FCS_CKM.1 Cryptographic key generation] FCS_CKM.4 Cryptographic key destruction 6.1.12 Rivest-Shamir-Adleman (RSA) Key Generation (optional) 203 The RSA key generation for the RSA/ECC/SHA library shall meet the requirement “Cryptographic key generation (FCS_CKM.1)” as specified below. FCS_CKM.1/RSA Cryptographic key generation Hierarchical to: No other components FCS_CKM.1.1/RSA The TSF shall generate the RSA public/private key pair in accordance with the specified cryptographic key generation algorithm and with the specified cryptographic key size from 1280-bit up to 2048-bit with 2-bit granularity that meet the following standards: [ETSI TS 102 176-1], section 6.2.2.1 Key and parameter generation algorithm rsagen1 and [ISO 18032], Incremental search. Dependencies: [FCS_CKM.2 Cryptographic key distribution or FCS_COP.1 Cryptographic operation] FCS_CKM.4 Cryptographic key destruction Note 1) The RSA cryptographic key generation of the TOE generates two primes P and Q with the equal bit length, while the standard recommends to generate two primes P and Q such that 0.1 < |log_2(P)–log_2(Q)| < 30. Note 2) While the standard specifies that the private exponent D should be larger than the square root of the RSA modulus, i.e. D > sqrt(N), this verification is not performed by the RSA cryptographic key generation of the TOE. Note 3) The RSA cryptographic key generation of the TOE performs a number of Miller–Rabin tests to ensure that the probability that the generated prime candidate is not a prime is below 2^(–100). Public ST Lite_Ver 16.2 6 IT security requirements 75/112 204 The TOE shall meet the requirement “Cryptographic key destruction (FCS_CKM.4)” as specified below. FCS_CKM.4/RSA Cryptographic key destruction Hierarchical to: No other components. FCS_CKM.4.1/RSA The TSF shall destroy cryptographic keys in accordance with a specified cryptographic key destruction method overwriting or zeroing that meets the following: none. Dependencies: [FDP_ITC.1 Import of user data without security attributes, or FDP_ITC.2 Import of user data with security attributes, or FCS_CKM.1 Cryptographic key generation] Application Note The key destruction FCS_CKM.4/RSA applies only for the keys stored by the CM1 Secure RSA/ECC/SHA library. This internal key storage can be cleared by hardware resetting. Clearing of keys that are provided by the smartcard embedded software to the CM1 Secure RSA/ECC/SHA library is under the responsibility of the smartcard embedded software. 6.1.13 Elliptic Curve DSA Operation (optional) 205 The ECC library of the TOE shall meet the requirement “Cryptographic operation (FCS_COP.1)” as specified below. FCS_COP.1/ECDSA Cryptographic operation Hierarchical to: No other components FCS_COP.1.1/ECDSA The TSF shall perform the signature generation/verification in accordance with the specified cryptographic algorithm ECDSA and cryptographic key sizes from 192- bit up to 512-bit that meet the following standard: [ANS X9.62] , section 7.3 Signing Process and section 7.4 Verifying Process. Dependencies: [FDP_ITC.1 Import of user data without security attributes or FDP_ITC.2 Import of user data with security attributes, or FCS_CKM.1 Cryptographic key generation] FCS_CKM.4 Cryptographic key destruction 6.1.14 Elliptic Curve DSA Key Generation (optional) 206 The key generation for the ECC library shall meet the requirement “Cryptographic key generation Public ST Lite_Ver 16.2 6 IT security requirements 76/112 (FCS_CKM.1)” as specified below. FCS_CKM.1/ECDSA Cryptographic key generation Hierarchical to: No other components FCS_CKM.1.1/ECDSA The TSF shall generate ECC cryptographic keys in accordance with the cryptographic key generation algorithm specified in [ANS X9.62] and with the cryptographic key sizes from 192-bit up to 512-bit that meet the following standard: [ANS X9.62], section A.4.3 Elliptic Curve Key Generation. Dependencies: [FCS_CKM.2 Cryptographic key distribution or FCS_COP.1 Cryptographic operation] FCS_CKM.4 Cryptographic key destruction Note1) The RSA/ECC/SHA library supports any valid curves over prime fields of size from 192-bit to 512-bit. However standard curves listed below whose security has been proven are in the scope of this evaluation. 1) [NIST curves]: Curves P-192, P-224, P-256, P-384 2) [Brainpool curves]: brainpoolP192r1, brainpoolP192t1, brainpoolP224r1, brainpoolP224t1, brainpoolP256r1, brainpoolP256t1, brainpoolP320r1, brainpoolP320t1, brainpoolP384r1, brainpoolP384t1, brainpoolP512r1, brainpoolP512t1, 3) [SEC-recommended curves]: secp192k1, secp192r1, secp224k1, secp224r1, secp256k1, secp256r1, secp384r1 207 The TOE shall meet the requirement “Cryptographic key destruction (FCS_CKM.4)” as specified below. FCS_CKM.4/ECDSA Cryptographic key destruction Hierarchical to: No other components. FCS_CKM.4.1/ECDSA The TSF shall destroy cryptographic keys in accordance with a specified cryptographic key destruction method zeroing that meets the following: none. Dependencies: [FDP_ITC.1 Import of user data without security attributes, or FDP_ITC.2 Import of user data with security attributes, or FCS_CKM.1 Cryptographic key generation] Application Note The key destruction FCS_CKM.4/ECDSA applies only for the keys stored by the CM1 Secure RSA/ECC/SHA library. This internal key storage can be cleared by hardware resetting. Clearing of keys that are provided by the smartcard embedded software to the CM1 Secure RSA/ECC/SHA library is under the responsibility of the smartcard embedded software. Public ST Lite_Ver 16.2 6 IT security requirements 77/112 6.1.15 Elliptic Curve Diffie-Hellman (ECDH) Key Agreement (optional) 208 The ECC library of the TOE shall meet the requirement “Cryptographic operation (FCS_COP.1)” as specified below. FCS_COP.1/ECDH Cryptographic operation Hierarchical to: No other components FCS_COP.1.1/ECDH The TSF shall perform the key exchange in accordance with the specified cryptographic algorithm ECDH and cryptographic key sizes from 192-bit up to 512- bit that meet the following standard: [ANS X9.63], section 5.4.1 Standard Diffie- Hellman primitive. Dependencies: [FDP_ITC.1 Import of user data without security attributes or FDP_ITC.2 Import of user data with security attributes, or FCS_CKM.1 Cryptographic key generation] FCS_CKM.4 Cryptographic key destruction Note1) The RSA/ECC/SHA library supports any valid curves over prime fields of size from 192-bit to 512-bit. However standard curves listed below whose security has been proven are in the scope of this evaluation. 1) [NIST curves]: Curves P-192, P-224, P-256, P-384 2) [Brainpool curves]: brainpoolP192r1, brainpoolP192t1, brainpoolP224r1, brainpoolP224t1, brainpoolP256r1, brainpoolP256t1, brainpoolP320r1, brainpoolP320t1, brainpoolP384r1, brainpoolP384t1, brainpoolP512r1, brainpoolP512t1, 3)[SEC-recommended curves]: secp192k1, secp192r1, secp224k1, secp224r1, secp256k1, secp256r1, secp384r1 Note2) The implemented routines can be used with ephemeral or static private keys. The base point is assumed to be public. Note3) For full compatibility, the user is responsible to perform step 2 of [ANS X9.63], section 5.2.2.1, prior to using the ECDH_generate function. 209 The TOE shall meet the requirement “Cryptographic key destruction (FCS_CKM.4)” as specified below. FCS_CKM.4/ECDH Cryptographic key destruction Hierarchical to: No other components. FCS_CKM.4.1/ECDH The TSF shall destroy cryptographic keys in accordance with a specified cryptographic key destruction method overwriting or zeroing that meets the following: none. Dependencies: [FDP_ITC.1 Import of user data without security attributes, or FDP_ITC.2 Import of user data with security attributes, or FCS_CKM.1 Cryptographic key generation] Application Note The key destruction FCS_CKM.4/ECDH applies only for the keys stored Public ST Lite_Ver 16.2 6 IT security requirements 78/112 by the CM1 Secure RSA/ECC/SHA library. This internal key storage can be cleared by hardware resetting. Clearing of keys that are provided by the smartcard embedded software to the CM1 Secure RSA/ECC/SHA library is under the responsibility of the smartcard embedded software. 6.1.16 Secure Hash Algorithm (SHA) (optional) 210 The Secure Hash Algorithm (SHA) of the TOE shall meet the requirement “Cryptographic operation (FCS_COP.1)” as specified below. FCS_COP.1/SHA Cryptographic operation - SHA Hierarchical to: No other components FCS_COP.1.1/SHA The TSF shall perform hashing in accordance with a specified cryptographic algorithm SHA-224, SHA-256, SHA-384, SHA-512 and cryptographic key sizes none that meet the following: [FIPS 180-4]. Note1) The TORNADO2MX2 RSA/ECC/SHA library provides the functionalities for computation of hash values. The use of these functionalities for keyed hash operations like HMAC or similar, is not subject of this TOE and requires specific security improvements and DPA analysis by the operating system which is not part of the TOE. The SHA-224, SHA-256, SHA-384 and SHA-512 functionalities are intended to be used for ECDSA signature generation and verification. Dependencies: [FDP_ITC.1 Import of user data without security attributes or FDP_ITC.2 Import of user data with security attributes, or FCS_CKM.1 Cryptographic key generation] FCS_CKM.4 Cryptographic key destruction 6.1.17 Bootloader 211 The TOE Functional Requirement “Limited capabilities – Loader(FMT_LIM.1/Loader)” is specified as follows. FMT_LIM.1/Loader Limited capabilities Hierarchical to: No other components. FMT_LIM.1.1/Loader The TSF shall be designed and implemented in a manner that limits its capabilities so that in conjunction with “Limited availability (FMT_LIM.2)” the following policy is enforced: Deploying Loader functionality after locking to Flash Reset does not allow stored user data to be disclosed or manipulated by unauthorized user. Dependencies: FMT_LIM.2 Limited availability. Public ST Lite_Ver 16.2 6 IT security requirements 79/112 The TOE Functional Requirement “Limited availability – Loader (FMT_LIM.2/Loader)” is specified as follows. FMT_LIM.2/Loader Limited availability - Loader Hierarchical to: No other components. FMT_LIM.2.1/Loader The TSF shall be designed in a manner that limits its availability so that in conjunction with “Limited capabilities (FMT_LIM.1)” the following policy is enforced: The TSF prevents deploying the Loader functionality after locking the chip to Flash booting mode. Dependencies: FMT_LIM.1 Limited capabilities. The TOE Functional Requirement “Inter-TSF trusted channel (FTP_ITC.1)” is specified as follows. FTP_ITC.1 Inter-TSF trusted channel Hierarchical to: No other components. FTP_ITC.1.1 The TSF shall provide a communication channel between itself and the authorized user for using the Bootloader that is logically distinct from other communication channels and provides assured identification of its end points and protection of the channel data from modification or disclosure. FTP_ITC.1.2 The TSF shall permit another trusted IT product to initiate communication via the trusted channel. FTP_ITC.1.3 The TSF shall initiate communication via the trusted channel for deploying Loader mutual Authentication and establishment of session keys. Dependencies: No dependencies. The TOE Functional Requirement “Basic data exchange confidentiality (FDP_UCT.1)” is specified as follows. FDP_UCT.1 Basic data exchange confidentiality Hierarchical to: No other components. FDP_UCT.1.1 The TSF shall enforce the Loader SFP to receive user data in a manner protected from unauthorised disclosure. Dependencies: [FTP_ITC.1 Inter-TSF trusted channel, or FTP_TRP.1 Trusted path] [FDP_ACC.1 Subset access control, or FDP_IFC.1 Subset information flow control] Public ST Lite_Ver 16.2 6 IT security requirements 80/112 The TOE Functional Requirement “Data exchange integrity (FDP_UIT.1)” is specified as follows. FDP_UIT.1 Data exchange integrity Hierarchical to: No other components. FDP_UIT.1.1 The TSF shall enforce the Loader SFP to receive user data in a manner protected from modification, deletion, insertion errors. FDP_UIT.1.2 The TSF shall be able to determine on receipt of user data, whether modification, deletion, insertion has occurred. Dependencies: [FTP_ITC.1 Inter-TSF trusted channel, or FTP_TRP.1 Trusted path] [FDP_ACC.1 Subset access control, or FDP_IFC.1 Subset information flow control] The TOE Functional Requirement “Subset access control - Loader (FDP_ACC.1/Loader)” is specified as follows. FDP_ACC.1/ Loader Subset access control - Loader Hierarchical to: No other components. FDP_ACC.1.1/ Loader The TSF shall enforce the Loader SFP on (1) the subjects Loader authorized users, (2) the objects user data in FLASH (3) the operation deployment of Loader Dependencies: FDP_ACF.1 Security attribute based access control. Application Note 38: The TOE enforces the Loader SFP by FTP_ITC.1, FDP_UCT.1 and FDP_UIT.1 and FDP_ACF.1 to describe additional access control rules. The TOE Functional Requirement “Security attribute based access control - Loader (FDP_ACF.1/Loader)” is specified as follows. FDP_ACF.1/ Loader Security attribute based access control - Loader Hierarchical to: No other components. FDP_ACF.1.1/ Loader The TSF shall enforce the Loader SFP to objects based on the following: (1) the subjects Loader authorized users with security attributes FLASH write. Public ST Lite_Ver 16.2 6 IT security requirements 81/112 (2) the objects user data in FLASH with security attributes FLASH write. FDP_ACF.1.2/ Loader The TSF shall enforce the following rules to determine if an operation among controlled subjects and controlled objects is allowed: Bootloader can do write operation in FLASH after a successful Authentication. FDP_ACF.1.3/ Loader The TSF shall explicitly authorize access of subjects to objects based on the following additional rules: FLASH can be controlled based on security attributes, which can be limited by Bootloader APDU command. FDP_ACF.1.4/ Loader The TSF shall explicitly deny access of subjects to objects based on the following additional rules: Bootloader cannot access the FLASH without successful authentication. Dependencies: FMT_MSA.3 Static attribute initialization. 6.1.18 Authentication Proof of Identity 212 The TOE shall meet the requirement “Authentication Proof of Identity (FIA_API.1)” as specified below. FIA_API.1 Authentication Proof of Identity Hierarchical to: No other components Dependencies: No dependencies. FIA_API.1.1 The TSF shall provide a mutual authentication of Bootloader to prove the identity of the TOE to an external entity Public ST Lite_Ver 16.2 6 IT security requirements 82/112 6.1.19 Summary of Security Functional Requirements Security Functional Requirements Limited fault tolerance (FRU_FLT.2) Failure with preservation of secure state (FPT_FLS.1) Audit storage (FAU_SAS.1) Stored data confidentiality (FDP_SDC.1) Stored data integrity monitoring and action (FDP_SDI.2) Limited capabilities(FMT_LIM.1) Limited availability (FMT_LIM.2) Resistance to physical attack (FPT_PHP.3) Basic internal transfer protection (FDP_ITT.1) Basic internal TSF data transfer protection (FPT_ITT.1) Subset information flow control (FDP_IFC.1) Authentication Proof of Identity (FIA_API.1) Quality metric for random numbers (FCS_RNG.1/P2High) Quality metric for random numbers (FCS_RNG.1/RGS_B1) Alternative quality metric for random numbers (FCS_RNG.1/EHP) Table 3 Security Functional Requirements defined in Smart Card IC Protection Profile Public ST Lite_Ver 16.2 6 IT security requirements 83/112 Security Functional Requirements Subset access control (FDP_ACC.1) Security attribute based access control (FDP_ACF.1) Static attribute initialization (FMT_MSA.3 ) Management of security attributes (FMT_MSA.1) Specification of management functions (FMT_SMF.1) Cryptographic operation (FCS_COP.1/TDES) Cryptographic operation (FCS_COP.1/AES) Cryptographic key destruction (FCS_CKM.4/TDES, FCS_CKM.4/AES, FCS_CKM.4/RSA, FCS_CKM.4/ECDSA, FCS_CKM.4/ECDH) Cryptographic operation (FCS_COP.1/RSA) (optional) Cryptographic key generation (FCS_CKM.1/ RSA) (optional) Cryptographic operation (FCS_COP.1/ECDSA) (optional) Cryptographic operation (FCS_COP.1/ECDH) (optional) Cryptographic key generation (FCS_CKM.1/ ECDSA) (optional) Cryptographic key generation (FCS_COP.1/SHA) (optional) Limited capabilities(FMT_LIM.1/Loader) Limited availability - Loader(FMT_LIM.2/Loader) Inter-TSF trusted channel (FTP_ITC.1) Basic data exchange confidentiality (FDP_UCT.1) Data exchange integrity (FDP_UIT.1) Subset access control - Loader (FDP_ACC.1/ Loader) Security attribute based access control - Loader (FDP_ACF.1/Loader) Random number generation – P2 High(FCS_RNG.1) Random number generation – EHP(FCS_RNG.1/EHP) Table 4 Augmented Security Functional Requirements Public ST Lite_Ver 16.2 6 IT security requirements 84/112 6.2 TOE Assurance Requirements 213 The Security Target will be evaluated according to Security Target evaluation (Class ASE) 214 The TOE Assurance Requirements for the evaluation of the TOE and its development and operating environment are those taken from the Evaluation Assurance Level 6 (EAL6) 215 and augmented by the following component ASE_TSS.2 216 corresponding to level “EAL6+”. 217 All refinements from Protection Profile BSI-PP-0084 version 1.0 for the assurance requirements (ALC_DEL, ALC_DVS, ALC_CMS, ALC_CMC, ADV_ARC, ADV_FSP, ADV_IMP, ATE_COV, AGD_OPE, AGD_PRE and AVA_VAN) have to be taken into consideration. In particular the document [12] is used in the context of vulnerability analysis. Class ADV: Development Architectural design (ADV_ARC.1) Security Policy Model (ADV_SPM.1) Functional Specification (ADV_FSP.5) Implementation Representation (ADV_IMP.2) TSF Internals (ADV_INT.3) TOE Design (ADV_TDS.5) Class AGD: Guidance documents activities Operational User Guidance (AGD_OPE.1) Preparative procedures (AGD_PRE.1) Class ALC: Life-cycle support CM Capabilities (ALC_CMC.5) CM Scope (ALC_CMS.5) Delivery (ALC_DEL.1) Development Security (ALC_DVS.2) Life Cycle Definition (ALC_LCD.1) Tools and Techniques (ALC_TAT.3) Class ASE: Security Target evaluation Conformance claims (ASE_CCL.1) Extended components definition (ASE_ECD.1) ST introduction (ASE_INT.1) Security objectives (ASE_OBJ.2) Derived security requirements (ASE_REQ.2) Security problem definition (ASE_SPD.1) TOE summary specification (ASE_TSS.2) Class ATE: Tests Coverage (ATE_COV.3) Depth (ATE_DPT.3) Public ST Lite_Ver 16.2 6 IT security requirements 85/112 Functional Tests (ATE_FUN.2) Independent Testing (ATE_IND.2) Class AVA: Vulnerability assessment Vulnerability Analysis (AVA_VAN.5) Public ST Lite_Ver 16.2 6 IT security requirements 86/112 6.3 Security Requirements Rationale 6.3.1 Rationale for the Security Functional Requirements 218 Table 7 below gives an overview, how the security functional requirements are combined to meet the security objectives. The detailed justification follows after the table. Objective TOE Security Functional and Assurance Requirements O.Leak-Inherent - FDP_ITT.1 “Basic internal transfer protection” - FPT_ITT.1 “Basic internal TSF data transfer protection” - FDP_IFC.1 “Subset information flow control” - AVA_VAN.5 “Advanced methodical vulnerability analysis” O.Phys-Probing - FDP_SDC.1 “Stored data confidentiality” - FPT_PHP.3 “Resistance to physical attack” O.Malfunction - FRU_FLT.2 “Limited fault tolerance - FPT_FLS.1 “Failure with preservation of secure state” - ADV_ARC.1 “Architectural Design with domain separation and non-bypassability” O.Phys-Manipulation - FDP_SDI.2 “Stored data integrity monitoring and action” - FPT_PHP.3 “Resistance to physical attack” O.Leak-Forced All requirements listed for O.Leak-Inherent - FDP_ITT.1, FPT_ITT.1, FDP_IFC.1, AVA_VAN.5 plus those listed for O.Malfunction and O.Phys-Manipulation - FRU_FLT.2, FPT_FLS.1, FPT_PHP.3, ADV_ARC.1 O.Abuse-Func - FMT_LIM.1 “Limited capabilities” - FMT_LIM.2 “Limited availability” plus those for O.Leak-Inherent, O.Phys-Probing, O.Malfunction, O.Phys-Manipulation, O.Leak-Forced - FDP_ITT.1, FPT_ITT.1, FDP_IFC.1, FPT_PHP.3, FRU_FLT.2, FPT_FLS.1, ADV_ARC.1 O.Identification - FAU_SAS.1 “Audit storage” O.RND - FCS_RNG.1/P2High “Quality metric for random numbers”, FCS_RNG.1/RGS_B1 “Quality metric for random numbers” or FCS_RNG.1/EHP “Alternative Quality metric for random numbers” plus those for O.Leak-Inherent, O.Phys-Probing, O.Malfunction, O.Phys-Manipulation, O.Leak-Forced - FDP_ITT.1, FPT_ITT.1, FDP_IFC.1, FPT_PHP.3, FRU_FLT.2, FPT_FLS.1, AVA_VAN.5, ADV_ARC.1 OE.Resp-Appl not applicable Public ST Lite_Ver 16.2 6 IT security requirements 87/112 Objective TOE Security Functional and Assurance Requirements OE.Process-Sec-IC not applicable O.Mem-Access - FDP_ACC.1 “Subset access control” - FDP_ACF.1 “Security attribute based access control” - FMT_MSA.3 “Static attribute initialisation” - FMT_MSA.1 “Management of security attributes” - FMT_SMF.1 “Specification of Management Functions” O.TDES - FCS_COP.1/TDES “Cryptographic operation” - FCS_CKM.4/TDES “Cryptographic key destruction” O.AES - FCS_COP.1/ AES “Cryptographic operation” - FCS_CKM.4/AES “Cryptographic key destruction” O.RSA - FCS_COP.1/RSA “Cryptographic operation” - FCS_CKM.1/RSA “Cryptographic key generation” - FCS_CKM.4/RSA “Cryptographic key destruction” O.ECDSA - FCS_COP.1/ ECDSA “Cryptographic operation” - FCS_CKM.1/ ECDSA “Cryptographic key generation” - FCS_CKM.4/ECDSA “Cryptographic key destruction” O.ECDH - FCS_COP.1/ ECDH “Cryptographic operation” - FCS_CKM.4/ECDH “Cryptographic key destruction” O.SHA - FCS_COP.1/SHA O.Authentication - FIA_API.1 ” Authentication Proof of Identity” OE.TOE_Auth not applicable O.Cap_Avail_Loader - FMT_LIM.1/Loader “Limited capabilities” - FMT_LIM.2/Loader “Limited availability – Loader” OE.Lim_Block_Loader not applicable O.Ctrl_Auth_Loader - FTP_ITC.1 "Inter-TSF trusted channel" - FDP_UCT.1 "Basic data exchange confidentiality" - FDP_UIT.1 "Data exchange integrity" - FDP_ACC.1/Loader "Subset access control - Loader" - FDP_ACF.1/Loader "Security attribute based access control - Loader" OE.Loader_Usage not applicable O.Prot_TSF_Confidentiality - FDP_ACC.1/Loader "Subset access control - Loader" - FDP_ACF.1/Loader "Security attribute based access control - Loader" Table 5 Security Requirements versus Security Objectives 219 The justification related to the security objective “Protection against Inherent Information Leakage (O.Leak-Inherent)” is as follows: Public ST Lite_Ver 16.2 6 IT security requirements 88/112 220 The refinements of the security functional requirements FPT_ITT.1 and FDP_ITT.1 together with the policy statement in FDP_IFC.1 explicitly require the prevention of disclosure of secret data (TSF data as well as user data) when transmitted between separate parts of the TOE or while being processed. This includes that attackers cannot reveal such data by measurements of emanations, power consumption or other behavior of the TOE while data are transmitted between or processed by TOE parts. 221 It is possible that the TOE needs additional support by the Security IC Embedded Software (e.g. timing attacks are possible if the processing time of algorithms implemented in the software depends on the content of secret). This support must be addressed in the Guidance Documentation. Together with this FPT_ITT.1, FDP_ITT.1 and FDP_IFC.1 are suitable to meet the objective. 222 The justification related to the security objective “Protection against Physical Probing (O.Phys-Probing)” is as follows: 223 The SFR FDP_SDC.1 requires the TSF to protect the confidentiality of the information of the user data stored in specified memory areas and prevent its compromise by physical attacks bypassing the specified interfaces for memory access. The scenario of physical probing as described for this objective is explicitly included in the assignment chosen for the physical tampering scenarios in FPT_PHP.3. Therefore, it is clear that this security functional requirement supports the objective. 224 It is possible that the TOE needs additional support by the Security IC Embedded Software (e. g. to send data over certain buses only with appropriate precautions). This support must be addressed in the Guidance Documentation. Together with this FPT_PHP.3 is suitable to meet the objective. 225 The justification related to the security objective “Protection against Malfunctions (O.Malfunction)” is as follows: 226 The definition of this objective shows that it covers a situation, where malfunction of the TOE might be caused by the operating conditions of the TOE (while direct manipulation of the TOE is covered O.Phys- Manipulation). There are two possibilities in this situation: Either the operating conditions are inside the tolerated range or at least one of them is outside of this range. The second case is covered by FPT_FLS.1, because it states that a secure state is preserved in this case. The first case is covered by FRU_FLT.2 because it states that the TOE operates correctly under normal (tolerated) conditions. The functions implementing FRU_FLT.2 and FPT_FLS.1 must work independently so that their operation cannot affected by the Security IC Embedded Software (refer to the refinement). Therefore, there is no possible instance of conditions under O.Malfunction, which is not covered. 227 The justification related to the security objective “Protection against Physical Manipulation (O.Phys-Manipulation)” is as follows: 228 The SFR FDP_SDI.2 requires the TSF to detect the integrity errors of the stored user data and react in case of detected errors. The scenario of physical manipulation as described for this objective is explicitly included in the assignment chosen for the physical tampering scenarios in FPT_PHP.3. Therefore, it is clear that this security functional requirement supports the objective. 229 It is possible that the TOE needs additional support by the Embedded Software (for instance by implementing FDP_SDI.1 to check data integrity with the help of appropriate checksums, refer to Section 6.1). This support must be addressed in the Guidance Documentation. Together with this FPT_PHP.3 is suitable to meet the objective. 230 The justification related to the security objective “Protection against Forced Information Leakage (O.Leak-Forced)“ is as follows: Public ST Lite_Ver 16.2 6 IT security requirements 89/112 231 This objective is directed against attacks, where an attacker wants to force an information leakage, which would not occur under normal conditions. In order to achieve this the attacker has to combine a first attack step, which modifies the behaviour of the TOE (either by exposing it to extreme operating conditions or by directly manipulating it) with a second attack step measuring and analysing some output produced by the TOE. The first step is prevented by the same measures which support O.Malfunction and O.Phys-Manipulation, respectively. The requirements covering O.Leak-Inherent also support O.Leak-Forced because they prevent the attacker from being successful if he tries the second step directly. 232 The justification related to the security objective “Protection against Abuse of Functionality (O.Abuse-Func)” is as follows: 233 This objective states that abuse of functions (especially provided by the IC Dedicated Test Software, for instance in order to read secret data) must not be possible in Phase 7 of the life-cycle. There are two possibilities to achieve this: (i) They cannot be used by an attacker (i. e. its availability is limited) or (ii) using them would not be of relevant use for an attacker (i. e. its capabilities are limited) since the functions are designed in a specific way. The first possibility is specified by FMT_LIM.2 and the second one by FMT_LIM.1. Since these requirements are combined to support the policy, which is suitable to fulfil O.Abuse-Func, both security functional requirements together are suitable to meet the objective. 234 Other security functional requirements which prevent attackers from circumventing the functions implementing these two security functional requirements (for instance by manipulating the hardware) also support the objective. The relevant objectives are also listed in Table 7. 235 It was chosen to define FMT_LIM.1 and FMT_LIM.2 explicitly (not using Part 2 of the Common Criteria) for the following reason: Though taking components from the Common Criteria catalogue makes it easier to recognise functions, any selection from Part 2 of the Common Criteria would have made it harder for the reader to understand the special situation meant here. As a consequence, the statement of explicit security functional requirements was chosen to provide more clarity. 236 The justification related to the security objective “TOE Identification (O.Identification)“ is as follows: 237 Obviously the operations for FAU_SAS.1 are chosen in a way that they require the TOE to provide the functionality needed for O.Identification. The Initialisation Data (or parts of them) are used for TOE identification. The technical capability of the TOE to store Initialisation Data and/or Pre-personalisation Data is provided according to FAU_SAS.1. 238 It was chosen to define FAU_SAS.1 explicitly (not using a given security functional requirement from Part 2 of the Common Criteria) for the following reason: The security functional requirement FAU_GEN.1 in Part 2 of the CC requires the TOE to generate the audit data and gives details on the content of the audit records (for instance data and time). The possibility to use the functions in order to store security relevant data which are generated outside of the TOE, is not covered by the family FAU_GEN or by other families in Part 2. Moreover, the TOE cannot add time information to the records, because it has no real time clock. Therefore, the new family FAU_SAS was defined for this situation. 239 The objective must be supported by organisational and other measures, which the TOE Manufacturer has to implement. These measures are a subset of those measures, which are examined during the evaluation of the assurance requirements of the classes AGD and ALC. 240 The justification related to the security objective “Random Numbers (O.RND)” is as follows: 241 FCS_RNG.1 requires the TOE to provide random numbers of good quality. The metrics associated to the DTRNG FRO are given by the SFRs FCS_RNG.1/P2High, FCS_RNG.1/RGS_B1 and FCS_RNG.1/EHP. Public ST Lite_Ver 16.2 6 IT security requirements 90/112 242 Other security functional requirements, which prevent physical manipulation and malfunction of the TOE (see the corresponding objectives listed in the table), support this objective because they prevent attackers from manipulating or otherwise affecting the random number generator. 243 Random numbers are often used by the Security IC Embedded Software to generate cryptographic keys for internal use. Therefore, the TOE must prevent the unauthorised disclosure of random numbers. Other security functional requirements which prevent inherent leakage attacks, probing and forced leakage attacks ensure the confidentiality of the random numbers provided by the TOE. 244 Depending on the functionality of specific TOEs the Security IC Embedded Software will have to support the objective by providing runtime-tests of the random number generator. Together, these requirements allow the TOE to provide cryptographically good random numbers and to ensure that no information about the produced random numbers is available to an attacker. 245 It was chosen to define FCS_RNG.1 explicitly, because Part 2 of the Common Criteria does not contain generic security functional requirements for Random Number generation. (Note, that there are security functional requirements in Part 2 of the Common Criteria, which refer to random numbers. However, they define requirements only for the authentication context, which is only one of the possible applications of random numbers.) 246 The security objective “Capability and availability of the Loader (O.Cap_Avail_Loader) is directly covered by the SFR FMT_LIM.1/Loader and FMT_LIM.2/Loader. 247 The security objective Access control and authenticity for the Loader (O.Ctrl_Auth_Loader) is covered by the SFR as follows: 248 The SFR FDP_ACC.1/Loader defines the subjects, objects and operations of the Loader SFP enforced by the SFR FTP_ITC.1, FDP_UCT.1, FDP_UIT.1 and FDP_ACF.1/Loader. 249 The SFR FTP_ITC.1 requires the TSF to establish a trusted channel with assured identification of its end points and protection of the channel data from modification or disclosure. 250 The SFR FDP_UCT.1 requires the TSF to receive data protected from unauthorised disclosure. 251 The SFR FDP_UIT.1 requires the TSF to verify the integrity of the received user data. 252 The SFR FDP_ACF.1/Loader requires the TSF to implement access control for the Loader functionality. 253 The FCS_COP.1/TDES and FCS_CKM.4/TDES meets the security objective “Cryptographic service Triple- DES (O.TDES)”. 254 The FCS_COP.1/AES and FCS_CKM.4/AES meets the security objective “Cryptographic service AES (O.AES)”. 255 The security functional requirement(s) “Cryptographic operation (FCS_COP.1/RSA, FCS_COP.1/ECDSA, ECDH)” exactly requires those functions to be implemented which are demanded by O.RSA or O.ECDSA or O.ECDH. FCS_CKM.1 supports the generation of keys needed for this cryptographic operations(optional). Therefore, FCS_COP.1/RSA, FCS_COP.1/ECDSA, FCS_COP.1/ECDH, FCS_CKM.1/RSA and FCS_CKM.1/ ECDSA are suitable to meet the security objective. 256 The FCS_COP.1/SHA meet the security objective “Cryptographic service SHA (O.SHA)”. 257 The security objective “Authentication to external entities (O.Authentication) is directly covered by the SFR FIA_API.1.. Public ST Lite_Ver 16.2 6 IT security requirements 91/112 258 The justification related to the security objective “Area based Memory Access Control (O.Mem-Access)” is as follows: 259 The security functional requirement “Subset access control (FDP_ACC.1)” with the related Security Function Policy (SFP) “Memory Access Control Policy” exactly require the implementation of an area based memory access control, which is a requirement from O.Mem-Access. Therefore, FDP_ACC.1 with its SFP is suitable to meet the security objective. 260 The security functional requirement “Static attribute initialisation (FMT_MSA.3)” requires that the TOE provides default values for the security attributes. Since the TOE is a hardware platform these default values are generated by the reset procedure. Therefore FMT_MSA.3 is suitable to meet the security objective O.Mem-Access. 261 The security functional requirement “Management of security attributes (FMT_MSA.1)” requires that the ability to change the security attributes is restricted to privileged subject(s). It ensures that the access control required by O.Mem-Access can be realised using the functions provided by the TOE. Therefore FMT_MSA.1 is suitable to meet the security objective O.Mem_Access. 262 Finally, the security functional requirement “Specification of Management Functions (FMT_SMF.1)” is used for the specification of the management functions to be provided by the TOE as required by O.MEM_ACCESS. Therefore, FMT_SMF.1 is suitable to meet the security objective O.Mem_Access. 263 The justification related to the security objective “Protection during Packaging, Finishing and Personalisation (OE.Process-Sec-IC)” is as follows: 264 The Composite Product Manufacturer has to use adequate measures to fulfil OE.Process-Sec-IC. Depending on the security needs of the application, the Security IC Embedded Software may have to support this for instance by using appropriate authentication mechanisms for personalisation functions. 265 The security objective Protection of the confidentiality of the TSF (O.Prot_TSF_Confidentiality) is covered by the SFR as follows: 266 The SFR FDP_ACC.1/Loader defines the subjects, objects and operations of the Loader SFP enforced by the FDP_ACF.1/Loader. 267 The SFR FDP_ACF.1/Loader requires the TSF to implement authentication mechanism for the Protection of the confidentiality of the TSF 6.3.2 Dependencies of Security Functional Requirements 268 Table 8 below lists the security functional requirements defined in this Protection Profile, their dependencies and whether they are satisfied by other security requirements defined in this Protection Profile. The text following the table discusses the remaining cases. Security Functional Requirement Dependencies Fulfilled by security requirements FRU_FLT.2 FPT_FLS.1 Yes FPT_FLS.1 None No dependency FMT_LIM.1 FMT_LIM.2 Yes FMT_LIM.2 FMT_LIM.1 Yes Public ST Lite_Ver 16.2 6 IT security requirements 92/112 Security Functional Requirement Dependencies Fulfilled by security requirements FAU_SAS.1 None No dependency FDP_SDC.1 None No dependency FDP_SDI.2 None No dependency FPT_PHP.3 None No dependency FDP_ITT.1 FDP_ACC.1 or FDP_IFC.1 Yes FDP_IFC.1 FDP_IFF.1 See discussion below FPT_ITT.1 None No dependency FCS_RNG.1/P2 high None No dependency FCS_RNG.1/RGS_B1 None No dependency FCS_RNG.1/EHP None No dependency FCS_COP.1 /TDES FCS_CKM.4 Yes (by environment, see discussion below) FDP_ITC.1 or FDP_ITC.2 (if not FCS_CKM.1) or FCS_CKM.1 Yes (by environment, see discussion below) FCS_CMK.4/TDES FDP_ITC.1 or FDP_ITC.2 (if not FCS_CKM.1) or FCS_CKM.1 Yes (by environment, see discussion below) FCS_COP.1 /AES FCS_CKM.4 Yes (by environment, see discussion below) FDP_ITC.1 or FDP_ITC.2 (if not FCS_CKM.1) or FCS_CKM.1 Yes (by environment, see discussion below) FCS_CMK.4/AES FDP_ITC.1 or FDP_ITC.2 (if not FCS_CKM.1) or FCS_CKM.1 Yes (by environment, see discussion below) FCS_CKM.1 /RSA (optional) FCS_COP.1 or FCS_CKM.2 Yes FCS_CKM.4 Yes (by environment, see discussion below) FCS_COP.1/RSA (optional) FDP_ITC.1 or FDP_ITC.2 or FCS_CKM.1 Yes FCS_CKM.4 Yes (by environment, see discussion below) FCS_CMK.4/RSA FDP_ITC.1 or FDP_ITC.2 (if not FCS_CKM.1) or FCS_CKM.1 Yes FCS_COP.1/ECDSA (optional) FDP_ITC.1 or FDP_ITC.2 or FCS_CKM.1 Yes FCS_CKM.4 Yes (by environment, see discussion Public ST Lite_Ver 16.2 6 IT security requirements 93/112 Security Functional Requirement Dependencies Fulfilled by security requirements below) FCS_CMK.4/ECDSA FDP_ITC.1 or FDP_ITC.2 (if not FCS_CKM.1) or FCS_CKM.1 Yes FCS_COP.1/ECDH (optional) FDP_ITC.1 or FDP_ITC.2, or FCS_CKM.1 Yes FCS_CKM.4 Yes (by environment, see discussion below) FCS_CMK.4/ECDH FDP_ITC.1 or FDP_ITC.2 (if not FCS_CKM.1) or FCS_CKM.1 Yes FCS_CKM.1 /ECDSA (optional) FCS_COP.1 or FCS_CKM.2 Yes FCS_CKM.4 Yes (by environment, see discussion below) FCS_COP.1/SHA (optional) FDP_ITC.1 or FDP_ITC.2 Yes See discussion below FCS_CKM.1 or FCS_CKM.4 See discussion below FDP_ACC.1 FDP_ACF.1 Yes FDP_ACF.1 FDP_ACC.1 FMT_MSA.3 Yes Yes FMT_MSA.3 FMT_MSA.1 FMT_SMR.1 Yes See discussion below FMT_MSA.1 FDP_ACC.1 or FDP_IFC.1 FMT_SMR.1 FMT_SMF.1 Yes See discussion below Yes FMT_SMF.1 None No dependency FMT_LIM.1/Loader FMT_LIM.2 Yes FMT_LIM.2/Loader FMT_LIM.1 Yes FTP_ITC.1 None No dependency FDP_UCT.1 FTP_ITC.1 or FTP_TRP.1, FDP_ACC.1 or FDP_IFC.1 Yes FDP_UIT.1 FTP_ITC.1 or FTP_TRP.1, FDP_ACC.1 or FDP_IFC.1 Yes FDP_ACC.1/ Loader FDP_ACF.1 Yes FDP_ACF.1/ Loader FMT_MSA.3 See discussion below FDP_ACC.1 Yes FIA_API.1 None No dependency Table 6 Dependencies of the Security Functional Requirements Public ST Lite_Ver 16.2 6 IT security requirements 94/112 269 Part 2 of the Common Criteria defines the dependency of FDP_IFC.1 (information flow control policy statement) on FDP_IFF.1 (Simple security attributes). The specification of FDP_IFF.1 would not capture the nature of the security functional requirement nor add any detail. As stated in the Data Processing Policy referred to in FDP_IFC.1 there are no attributes necessary. The security functional requirement for the TOE is sufficiently described using FDP_ITT.1 and its Data Processing Policy (FDP_IFC.1). Therefore the dependency is considered satisfied. 270 In particular the security functional requirements providing resistance of the hardware against manipulations (e. g. FPT_PHP.3) support all other more specific security functional requirements (e. g. FCS_RNG.1) because they prevent an attacker from disabling or circumventing the latter. Together with the discussion of the dependencies above this shows that the security functional requirements build a mutually supportive whole. 271 The functional requirement FCS_CKM.1 which is dependent to FCS_COP.1/TDES and FCS_COP.1/AES is not included in this Security Target since the TOE only provides an engine for encryption and decryption. But the Security IC Embedded Software may fulfill this requirement related to the needs of the implemented application. The dependent requirements of FCS_COP.1/TDES and FCS_COP.1/AES concerning this function shall be fulfilled by the environment (Security IC Embedded Software). 272 The TOE provides the cryptographic key generation for RSA and ECDSA by the TOE (FCS_CKM.1/RSA, FCS_CKM.1/ECDSA), but it is up to the Smart Card Embedded Software’s security policy to adopt the cryptographic key generation by the TOE or use the cryptographic key generation by the Smart Card Embedded Software. The dependent requirements of FCS_COP.1/RSA and FCS_COP.1/ECDSA shall be fulfilled by the environment (Security IC Embedded Software). 273 The functional requirement FCS_CKM.1 which is dependent to FCS_COP.1/ECDH is not included in this Security Target. But the Security IC Embedded Software may fulfill this requirement related to the needs of the implemented application. The dependent requirements of FCS_COP.1/ECDH concerning this function shall be fulfilled by the environment (Security IC Embedded Software). 274 Since FCS_COP.1/SHA is a keyless algorithm, the dependencies FCS_CKM.1 and FCS_CKM.4 are not required. 275 The dependency FMT_SMR.1 introduced by the two components FMT_MSA.1 and FMT_MSA.3 is considered to be satisfied because the access control specified for the intended TOE is not role-based but enforced for each subject. Therefore, there is no need to identify roles in form of a security functional requirement FMT_SMR.1. 276 The dependency FMT_MSA.3 of FDP_ACF.1/Loader is not be necessary. The security attributes of ROM and Flash used to enforce the Loader SFP are fixed by the IC manufacturer. The access attribute of ROM and Flash memory have DEFAULT value. 6.3.3 Rationale for the Assurance Requirements 277 The assurance level EAL6 and the augmentation with the requirement ASE_TSS.2 were chosen to demonstrate that the TOE fulfils the high-level Common Criteria requirements. An assurance level of EAL6 is required for this type of TOE since it is intended to defend against sophisticated attacks. This evaluation assurance level was selected since it is designed to permit a developer to gain maximum assurance from positive security engineering based on good commercial practices. In order to provide a meaningful level of Public ST Lite_Ver 16.2 6 IT security requirements 95/112 assurance that the TOE provides an adequate level of defence against such attacks, the evaluators should have access to the low level design and all the source code. 278 In addition, the TOE security policy is formally described and its security objective i.e. the complete memory access control is formally proved. The ASE_TSS.2 was chosen to demonstrate further assurance extensions provided by the TOE. 6.3.3.1 ADV_SPM.1 Formal TOE Security Policy Model 279 The formally modeled security policy consists of the complete TSF access control:  The access control to the security registers, the Flash, ROM regions and Booting memory area are correctly enforced.  The access control with respect to the MPU memory areas is correctly enforced, in particular:  The consistency of the memory areas is correctly enforced. 6.3.3.2 ASE_TSS.2 TOE Summary specification with architectural design summary 280 The augmentation ASE_TSS.2 is required in order to provide the potential users (e.g. the embedded software developers) with a succinct but comprehensive explanation on the TOE security functions that protect it against interference, logical tampering and bypass. This description is also necessary to establish the component ASE_TSS.2 for any composed TOE. 281 This assurance component is a higher hierarchical component to EAL6. ASE_TSS.2 has two dependencies (ASE_INT.1 and ASE_REQ.1) that both are satisfied by this TOE 6.3.4 Security Requirements are Internally Consistent 282 The discussion of security functional requirements and assurance components in the preceding sections has shown that mutual support and consistency are given for both groups of requirements. The arguments given for the fact that the assurance components are adequate for the functionality of the TOE also shows that the security functional requirements and assurance requirements support each other and that there are no inconsistencies between these groups. 283 The security functional requirements FDP_SDC.1 and FDP_SDI.2 address the protection of user data in the specified memory areas against compromise and manipulation. The security functional requirement FPT_PHP.3 makes it harder to manipulate data. This protects the primary assets identified in Section 3.1 and other security features or functionality which use these data. 284 Though a manipulation of the TOE (refer to FPT_PHP.3) is not of great value for an attacker in itself, it can be an important step in order to threaten the primary assets. Therefore, the security functional requirement FPT_PHP.3 is not only required to meet the security objective O.Phys-Manipulation. Instead it protects other security features or functions of both the TOE and the Security IC Embedded Software from being bypassed, deactivated or changed. In particular this may pertain to the security features or functions being specified using FDP_ITT.1, FPT_ITT.1, FPT_FLS.1, FMT_LIM.2, FCS_RNG.1, and those implemented in the Security IC Embedded Software. 285 A malfunction of TSF (refer to FRU_FLT.2 and FPT_FLS.1) can be an important step in order to threaten the primary assets. Therefore, the security functional requirements FRU_FLT.2 and FPT_FLS.1 are not only required to meet the security objective O.Malfunction. Instead they protect other security features or functions of both the TOE and the Security IC Embedded Software from being bypassed, deactivated or changed. In particular this pertains to the security features or functions being specified using FDP_ITT.1, Public ST Lite_Ver 16.2 6 IT security requirements 96/112 FPT_ITT.1, FMT_LIM.1, FMT_LIM.2, FCS_RNG.1, and those implemented in the Security IC Embedded Software. 286 In a forced leakage attack the methods described in “Malfunction due to Environmental Stress” (refer to T.Malfunction) and/or “Physical Manipulation” (refer to T.Phys-Manipulation) are used to cause leakage from signals which normally do not contain significant information about secrets. Therefore, in order to avert the disclosure of primary assets it is important that the security functional requirements averting leakage (FDP_ITT.1, FPT_ITT.1) and those against malfunction (FRU_FLT.2 and FPT_FLS.1) and physical manipulation (FPT_PHP.3) are effective and bind well. The security features and functions against malfunction ensure correct operation of other security functions (refer to above) and help to avert forced leakage themselves in other attack scenarios. The security features and functions against physical manipulation make it harder to manipulate the other security functions (refer to above). 287 Physical probing (refer to FPT_PHP.3) shall directly avert the disclosure of primary assets. In addition, physical probing can be an important step in other attack scenarios if the corresponding security features or functions use secret data. For instance the security functional requirement FMT_LIM.2 may use passwords. Therefore, the security functional requirement FPT_PHP.3 (against probing) help to protect other security features or functions including those being implemented in the Security IC Embedded Software. Details depend on the implementation. 288 Leakage (refer to FDP_ITT.1, FPT_ITT.1) shall directly avert the disclosure of primary assets. In addition, inherent leakage and forced leakage (refer to above) can be an important step in other attack scenarios if the corresponding security features or functions use secret data. For instance the security functional requirement FMT_LIM.2 may use passwords. Therefore, the security functional requirements FDP_ITT.1 and FPT_ITT.1 help to protect other security features or functions implemented in the Security IC Embedded Software (FDP_ITT.1) or provided by the TOE (FPT_ITT.1). Details depend on the implementation. 289 The user data of the Composite TOE are treated as required to meet the requirements defined for the specific application context (refer to Treatment of user data of the Composite TOE (A.Resp-Appl)). However, the TOE may implement additional functions. This can be a risk if their interface cannot completely be controlled by the Security IC Embedded Software. Therefore, the security functional requirements FMT_LIM.1 and FMT_LIM.2 are very important. They ensure that appropriate control is applied to the interface of these functions (limited availability) and that these functions, if being usable, provide limited capabilities only. 290 The combination of the security functional requirements FMT_LIM.1 and FMT_LIM.2 ensures that (especially after TOE Delivery) these additional functions cannot be abused by an attacker to (i) disclose or manipulate user data of the Composite TOE, (ii) to manipulate (explore, bypass, deactivate or change) security features or services of the TOE or of the Security IC Embedded Software or (iii) to enable other attacks on the assets. Hereby the binding between these two security functional requirements is very important: 291 The security functional requirement Limited Capabilities (FMT_LIM.1) must close gaps which could be left by the control being applied to the function’s interface (Limited Availability (FMT_LIM.2)). Note that the security feature or function which limits the availability can be bypassed, deactivated or changed by physical manipulation or a malfunction caused by an attacker. Therefore, if Limited Availability (FMT_LIM.2) is vulnerable1, it is important to limit the capabilities of the functions in order to limit the possible benefit for an attacker. 292 The security functional requirement Limited Availability (FMT_LIM.2) must close gaps which could result from the fact that the function’s kernel in principle would allow to perform attacks. The TOE must limit the Public ST Lite_Ver 16.2 6 IT security requirements 97/112 availability of functions which potentially provide the capability to disclose or manipulate user data of the Composite TOE, to manipulate security features or functions of the TOE or of the Security IC Embedded Software or to enable an attack. Therefore, if an attacker could benefit from using such functions1F, it is important to limit their availability so that an attacker is not able to use them. 293 No perfect solution to limit the capabilities (FMT_LIM.1) is required if the limited availability (FMT_LIM.2) alone can prevent the abuse of functions. No perfect solution to limit the availability (FMT_LIM.2) is required if the limited capabilities (FMT_LIM.1) alone can prevent the abuse of functions. Therefore, it is correct that both requirements are defined in a way that they together provide sufficient security. 294 It is important to avert malfunctions of TSF and of security functions implemented in the Security IC Embedded Software (refer to above). There are two security functional requirements which ensure that malfunctions cannot be caused by exposing the TOE to environmental stress. First it must be ensured that the TOE operates correctly within some limits (Limited fault tolerance (FRU_FLT.2)). Second the TOE must prevent its operation outside these limits (Failure with preservation of secure state (FPT_FLS.1)). Both security functional requirements together prevent malfunctions. The two functional requirements must define the “limits”. Otherwise there could be some range of operating conditions which is not covered so that malfunctions may occur. Consequently, the security functional requirements Limited fault tolerance (FRU_FLT.2) and Failure with preservation of secure state (FPT_FLS.1) are defined in a way that they together provide sufficient security. 295 The security functional requirements required to meet the security objectives O.Leak-Inherent, O.Phys- Probing, O.Malfunction, O.Phys-Manipulation and O.Leak-Forced protect the cryptographic algorithms (FCS_COP.1) and the cryptographic key generations (FCS_CKM.1). Therefore these security functional requirements support the secure implementation and operation of FCS_COP.1 and FCS_CKM.1. 296 Parts of the Smartcard IC Embedded Software may cause security violations by accidentally or deliberately accessing restricted data (which may include code). In order to avert the memory access violation it is important to the security functional requirement defining the scope where the Memory Access Policy is applied (FDP_ACC.1) and the security functional requirement defining the Memory Access Policy(FDP_ACF.1), and the security functional requirement ensuring the default value of security attribute(FMT_MSA.3) and the security functional requirement managing security attribute ( FMT_MSA.1) and the security functional requirement performing security management function(FMT_SMF.1) are effective and bind well. 297 Two refinements from the PP [5] have to be discussed here in the ST as the assurance level is increased. The refinement for ALC_CMS from the PP [5] can even be applied at the assurance level EAL 5 augmented with ALC_CMS.5. The assurance component ALC_CMS.4 is augmented to ALC_CMS.5 with aspects regarding the configuration control system for the TOE. The refinement is not touched. The refinement for ADV_FSP from the PP [5] can even be applied at the assurance level EAL 5 augmented with ADV_FSP.5. The assurance component ADV_FSP.4 is extended to ADV_FSP.5 with aspects regarding the description level. The level is increased from informal to semi-formal with informal description. The refinement is not touched by this measure. Public ST Lite_Ver 16.2 7 TOE SUMMARY SPECIFICATION 98/112 7 TOE SUMMARY SPECIFICATION 298 This chapter 7 TOE Summary Specification contains the following sections: 7.1 List of Security Functional Requirements Public ST Lite_Ver 16.2 7 TOE SUMMARY SPECIFICATION 99/112 7.1 List of Security Functional Requirements SFR1: FPT_FLS.1: Failure with preservation of secure state 299 The detection thresholds of TOE’s detectors are inside the operating range of the TOE. Therefore abnormal events/failures are detected before the secure state is compromised. This allows to take User’s defined appropriate actions by software or to immediately RESET the TOE. 300 The secure state is maintained by TOE’s detectors. The TOE’s detectors are monitoring the failure occurs. If the failures happen, the TOE goes into RESET state. This satisfies the FPT_FLS.1 “Failure with preservation of secure state.” TOE’s Detectors 301 These functions records in register the events notified by the detectors. The software configures the reaction in case of detection: ● The TOE is immediately reset when an event is detected. ● Or, a special function register bit is set. TOE’s detectors are implemented by the hardware. The detection cannot be affected or bypassed by Smartcard Embedded Software. The reaction to the detection can be configured by the software. The influence on security and the way how to configure it is described in details in the User’s Manual. Therefore, FPT_FLS.1 is implemented by TOE. 302 Security domains are maintained since accesses to the access-prohibited area are trapped by this access control function. SFR2: FRU_FLT.2: Limited fault tolerance 303 All operating signals are filtered/regulated in order to prevent malfunction. TOE’s Filters 304 These filters are used for preventing noise, glitches and extremely high frequency in the external reset or clock pad from causing undefined or unpredictable behavior of the chip. Integrity Checkers 305 These Integrity Checkers are used for preventing noise and laser from causing undefined or unpredictable behavior of the chip. 306 TOE’s filters and integrity checkers are implemented by the hardware. The filtering cannot be affected or bypassed by Smartcard Embedded Software. The reaction to the detection can be configured by the software. The influence on security and the way how to configure it is described in details in the User’s Manual. Therefore, FRU_FLT.2 is implemented by TOE. Public ST Lite_Ver 16.2 7 TOE SUMMARY SPECIFICATION 100/112 SFR3: FPT_PHP.3: Resistance to physical attacks 307 This requirement is achieved by security feature as the shield must be removed and bypassed in order to perform physical intrusive attacks. The TOE makes a reset or FIQ occurs to stops operation if a physical manipulation or physical probing attack is detected of the TOE layout unpractical. So these functionalities meet the security functional requirement of FPT_PHP.3: Resistance to physical attack. SFR4: FDP_ACC.1: Subset access control 308 This requirement is achieved by security register access control, invalid address access and access right for the code executed in FLASH. 1) Security registers access control: This security function manages access to the security control registers through access control security attributes. 2) Invalid address access: This function detects invalid address access occurrence. 3) Access rights for the code executed in FLASH 4) Access control for Operating state: This security function selects booting memory area. User can select ROM-BOOT or FLASH-BOOT 5) FLASH protection about Write operation SFR5: FDP_ACF.1: Security attributes based access control. 309 This is covered by the Privilege and User modes of the TOE. SFR6: FMT_MSA.3: Static attribute initialization. 310 All Special Function Registers including MPU have DEFAULT values after Power on Reset. The access attribute of ROM and Flash memory have DEFAULT values. SFR7: FMT_MSA.1: Management of security attributes. 311 This is achieved with the MPU, OPRMON and CPAMON feature. The Memory Protection Unit (MPU) enables user to partition memory and set individual protection attributes for each partition. This allows the operating system to control the memory regions accessible by a User mode application process. The OPRMON enables user to ROM protection attributes. This allows the operating system to control the ROM regions accessible by a User mode application process. The CPAMON enables user to FLASH and set individual protection attributes. SFR8: FMT_SMF.1: Specification of management functions. Public ST Lite_Ver 16.2 7 TOE SUMMARY SPECIFICATION 101/112 312 This is achieved via access to Special Function Registers of Memory Protection Unit(MPU). MPU provides Special Function Registers which defines the base address and the limit address for a partition. The Registers exist for Flash, and RAM. Additional Registers exist for defining the protection attribute for each partition. SFR9: FAU_SAS.1: Audit Storage 313 This is fulfilled by the traceability/identification data written once and for all during the TEST mode of the manufacturing process. 1) Non-reversibility of TEST mode and NORMAL mode: This function disables the TEST mode and enables the NORMAL mode of the TOE. This function ensures the non-reversibility of the NORMAL mode. This function is used once during the manufacturing process. 2) TEST mode communication protocol and data commands: This function is the proprietary protocol used to operate the chip in TEST mode. This function enforces the identification and authentication of the TEST administrator during the test phase of the manufacturing process. 3) Functional Tests: During the manufacturing process, the operation of the TOE and the embedded software checksum are verified. This security function ensures the correct operation of the TOE security functions and the integrity of the embedded software. 4) Identification: During the TEST mode of manufacturing process, traceability data are written in the non-volatile memory of the TOE. Once the TOE is switched from TEST to NORMAL mode, those traceability data are READ ONLY and cannot be modified anymore. In particular, user can identify the silicon chip version and the version of the device Dedicated SW parts (Test ROM code, Bootloader). The DTRNG FRO library, the EHP DTRNG FRO library and the RSA/ECC/SHA library versions are identified by the version function in the library. SFR10: FMT_LIM.1: Limited capabilities 314 TEST mode can be accessed only by the TEST administrator by supplying an authentication password through a proprietary protocol. Once the TOE is changed to NORMAL mode, TEST mode functions are no more available for NORMAL mode. SFR11: FMT_LIM.2: Limited availabilities 315 TEST mode can be accessed only by the TEST administrator by supplying an authentication password through a proprietary protocol. Once the TOE is changed to NORMAL mode, TEST mode commands are no more available for NORMAL mode. Functional test during manufacturing process is only available for TEST mode only. SFR12: FDP_IFC.1: Subset information flow control 316 Memory Encryption: This is achieved by the function protects the memory contents of the TOE from data analysis on the stored data as well as on internally transmitted data. Shield: This requirement is achieved by security feature as the Shield must be removed and bypassed in order to perform physical intrusive attacks. Public ST Lite_Ver 16.2 7 TOE SUMMARY SPECIFICATION 102/112 Life cycle detector: Life cycle detector detects if detector signals are modified or not. SFR13: FDP_ITT.1: Basic internal transfer protection 317 This requirement is achieved by the combination of the TOE security features TOE features 1) to 5) as it is unpractical to get access to internal signals and interpret them. 1) Static Address/Data scrambling for bus and memory: This function protects memory and address/data bus from probing attacks. 2) Dynamic Data encryption for bus: This function protects data bus from probing attacks. 3) Memory encryption: This security function protects the memory contents of the TOE from data analysis on the stored data as well as on internally transmitted data. 4) Synthesizable processor core: The Central Processing Unit (CPU) of the TOE is synthesizable with glue logic, which makes reverse engineering and signal identification more difficult. 5) De-synchronization and signal-to-noise ratio reduction mechanisms: The TOE operations can be made asynchronous. They make a full range of intrusive (e.g. probing attacks) and non intrusive attacks (e.g. side-channel attacks) more complex and difficult. SFR14: FPT_ITT.1: Basic internal TSF data transfer protection 318 This requirement is achieved by the combination of the TOE security features TOE features 1) to 5) as it is unpractical to get access to internal signals and interpret them. 1) Static Address/Data scrambling for bus and memory: This function protects memory and address/data bus from probing attacks. 2) Dynamic Data encryption for bus: This function protects data bus from probing attacks. 3) Memory encryption: This security function protects the memory contents of the TOE from data analysis on the stored data as well as on internally transmitted data. 4) Synthesizable processor core: The Central Processing Unit (CPU) of the TOE is synthesizable with glue logic, which makes reverse engineering and signal identification more difficult. 5) De-synchronization and signal-to-noise ratio reduction mechanisms: The TOE operations can be made asynchronous. They make a full range of intrusive (e.g. probing attacks) and non intrusive attacks (e.g. side- channel attacks) more complex and difficult. SFR15: FCS_RNG.1: Random number generation FCS_RNG.1/P2 High 319 This requirement is ensured by the design of the random number generation algorithm that makes use of Digital True Random Number Generator (DTRNG FRO) and the associated DTRNG FRO library conforming to BSI-AIS31 Class P2 requirements (German scheme). FCS_RNG.1/RGS_B1 320 This requirement is ensured by the design of the random number generation algorithm that makes use of Digital True Random Number Generator (DTRNG FRO) and the associated DTRNG FRO library Public ST Lite_Ver 16.2 7 TOE SUMMARY SPECIFICATION 103/112 conforming to some of ANSSI RGS_B1 requirements (French scheme). SFR16: FCS_COP.1: Cryptographic operation 321 This requirement is covered by the TOE. Triple Data Encryption Standard Engine 322 This function is used for encrypting and decrypting data using the Triple DES symmetric algorithm with 112bit or 168bit key size. (FCS_COP.1/TDES) AES (Advanced Encryption Standard) 323 This function supports the AES operation with 128 bit, 192bit and 256bit key size. (FCS_COP.1/AES) TORNADO2MX2 RSA Cryptographic Library as part of Secure RSA/ECC/SHA library and CM1 Secure RSA/ECC/SHA libraries (optional) 324 This function assists in the acceleration of modulo exponentiations required in the RSA encryption/decryption algorithm. (FCS_COP.1/RSA) 325 TORNADO2MX2 is a high speed modular multiplication coprocessor for the support of the RSA public key cryptosystem. The TORNADO2MX2 RSA Library is the software built on the TORNADO2MX2 coprocessor that provides high level interface for RSA-based algorithms. The functions of the library included in the evaluation are:  TND_RSA_SigSTD_Secure (RSA signature generation with the standard method)  TND_RSA_SigCRT_Secure (RSA signature generation with CRT method)  TND_RSA_Verify (RSA signature verification) This function performs the RSA signature verification. Since this function uses only the public information, it does not implement any dedicated countermeasures against the side-channel attacks.  RSA_R2modM_precompute_sec (RSA R^2 value precomputation for the standard method) This function pre-computes the R^2 mod N value for the Montgomery constant R and the standard RSA modulus N. The precomputed value will then be used for the subsequent RSA operations.  RSA_R2modPandQ_precompute_sec (RSA R^2 value precomputation for the CRT method) This function pre-computes the R^2 mod P and R^2 mod Q values for the Montgomery constant R and two RSA primes P and Q. The precomputed values will then be used for the subsequent RSA operations. 326 The functions TND_RSA_SigSTD_Secure and TND_RSA_SigCRT_Secure have some countermeasures against the timing attack, SPA, DPA and the fault attack. 327 The functions RSA_R2modM_precompute_sec and RSA_R2modPandQ_precompute_sec have some countermeasures against the fault attack. TORNADO2MX2 ECC Cryptographic Library as part of Secure RSA/ECC/SHA library and CM1 Secure RSA/ECC/SHA libraries (optional) 328 This function assists in the acceleration of required for the ECC cryptographic operations including the ECDSA signature generation/verification and the ECDH secret key derivation. (FCS_COP.1/ECDSA and FCS_COP.1/ECDH) Public ST Lite_Ver 16.2 7 TOE SUMMARY SPECIFICATION 104/112 329 TORNADO2MX2 RSA/ECC/SHA library provides a set of functions to implement elliptic curve cryptographic algorithms. In particular, it provides some functions to implement the ECDSA signature generation/verification and the ECDH secret key derivation. 330 The functions of the library included in the evaluation are:  ECDSA_sign_digest  ECDSA_verify_digest  ECDH_generate The functions ECDSA_sign_digest and ECDH_generate have some countermeasure against the timing attack, SPA and the fault attack. The ECDSA_verify_digets function has some countermeasures against the fault attack. The TORNADO2MX2 Secure RSA/ECC/SHA libraries provides the functions to calculate hash (digest) values using the SHA1, SHA224, SHA256, SHA384 and SHA 512 algorithm as specified in [FIPS PUB 180- 3], but only the functions related to SHA224, SHA256, SHA384 and SHA512 listed below are in the scope of this evaluation:  SHA224_init, SHA224_update, SHA224_final,  SHA256_init, SHA256_update, SHA256_final.  SHA384_init, SHA384_update, SHA384_final.  SHA512_init, SHA512_update, SHA512_final. SFR17: FCS_CKM.1: Cryptographic key generation 331 This requirement is covered by the TOE for the RSA/ECC key generation. (optional) RSA_KeyGen_Secure - FCS_CKM.1/RSA.  This function generates an RSA public/private key pair. ECDSA_keygen - FCS_CKM.1/ECDSA.  This function generates an ephemeral or static public/private key for the ECDSA signature generation. SFR18: Limited capabilities - Loader(FMT_LIM.1/Loader) This requirement is achieved by changing the Operating Mode Selection from ROM Booting mode to FLASH Booting mode and then locking the Operating Mode. The Bootloader is only supported in ROM Booting mode. In FLASH Booting mode, the Bootloader does not operate. The Bootloader supports an APDU command which changes the Operating Mode Selection from ROM Booting mode to FLASH Booting mode and an APDU command which locks the Operating Mode. If the chip is locked in FLASH Booting mode, the Bootloader cannot be deployed any more. It is then not possible to use the FLASH read and write commands of the Bootloader to read, download or modify any data or code in FLASH. SFR19: Limited availability – Loader (FMT_LIM.2/Loader) This requirement is achieved by changing the Operating Mode Selection from ROM Booting mode to FLASH Booting mode and then locking the Operating Mode. The Bootloader is only supported in ROM Booting mode. In FLASH Booting mode, the Bootloader does not operate. The Bootloader supports an APDU command which changes the Operating Mode Selection from ROM booting mode to FLASH Booting mode and an APDU command which locks the Operating Mode. If the chip is locked in FLASH booting Public ST Lite_Ver 16.2 7 TOE SUMMARY SPECIFICATION 105/112 mode, the TSF prevents deploying the Loader functionality. The Bootloader is then disabled and user cannot change the TOE Booting mode any more after the locking. SFR20: Inter-TSF trusted channel (FTP_ITC.1) This requirement is achieved by processing the Authentication sequence. This channel is only distinct from other communication channels and provides assured identification for its end points and protection of the channel data from modification or disclose. SFR21: Basic data exchange confidentiality (FDP_UCT.1) This requirement is achieved by secure writing. User data which is loaded to flash memory is encrypted data.. SFR22: Data exchange integrity (FDP_UIT.1) This requirement is achieved by appropriate code integrity mechanism. SFR23: Subset access control - Loader (FDP_ACC.1/ Loader) This requirement is achieved by following functions. ROM hiding function: The attribute of ROM is changed from Accessible ROM to Inaccessible ROM. Flash memory attribute as Read only SFR24: Security attribute based access control - Loader (FDP_ACF.1/Loader) This is covered by the ROM Booting(ROM Reset) and Flash Booting(Flash Reset) mode of the TOE. TOE can be set to ROM Booting(ROM Reset) and FLASH Booting(FLASH Reset) mode domains exclusively. All Bootloader APDU commands are accessible only in Rom Booting mode. The Flash Booting mode can not access all Bootloader APDU commands. SFR25: Stored data confidentiality (FDP_SDC.1) This requirement is achieved by the combination of the TOE security features TOE features 1) to 4) as it is unpractical to get access to internal signals and interpret them. 1) Static Address/Data scrambling for bus and memory: This function protects memory and address/data bus from probing attacks. 2) Data encryption for bus: This function protects data bus from probing attacks. 3) Memory encryption: This security function protects the memory contents of the TOE from data analysis on the stored data as well as on internally transmitted data. The algorithms used for encryption are proprietary. The ROM encryption is static key while the RAM and the FLASH encryption is dynamic key. RAM encryption is performed automatically while FLASH encryption is defined and managed by the embedded software. The key size for FLASH encryption is 16-byte. 4) Invalid address access: This function detects invalid address access occurrence. 5) Shield: This requirement is achieved by security feature as the shield must be removed and bypassed in order to perform physical intrusive attacks. 6) Life cycle detector: Life cycle detector detects if detector signals are modified or not. 7) Filters. 8) Non-reversibility of TEST and NORMAL modes: This function disables the TEST mode and enables the Public ST Lite_Ver 16.2 7 TOE SUMMARY SPECIFICATION 106/112 NORMAL mode of the TOE. This function ensures the non-reversibility of the NORMAL mode. This function is used once during the manufacturing process 9) Control of Booting mode: This requirement is achieved by changing the Operating Mode Selection. SFR26: Stored data integrity monitoring and action (FDP_SDI.2) This requirement is achieved by following functions. Flash/RAM: Error management features. SFR27: Authentication Proof of Identity (FIA_API.1) This requirement is achieved by processing the Authentication sequence. SFR28: FCS_RNG.1/EHP: Alternative Random number generation This requirement is ensured by the design of the random number generation algorithm that makes use of Digital True Random Number Generator (DTRNG FRO) and the associated EHP DTRNG FRO library. The generated random numbers pass AIS31 statistical tests (Test Procedure A) provided by BSI AIS31 metric. SFR29: FCS_CKM.4: Cryptographic key destruction This requirement is covered by the TOE. o Cryptographic Key destruction – Triple Data Encryption Standard Engine This requirement is achieved by overwriting the TDES key registers or by TOE reset (FCS_CKM.4/TDES). o Cryptographic Key destruction – AES (Advanced Encryption Standard) This requirement is achieved by overwriting the AES key registers or by TOE reset (FCS_CKM.4/AES). o Cryptographic Key destruction – RSA (Rivest-Shamir-Adleman) This requirement is achieved by TOE hardware reset (FCS_CKM.4/RSA). o Cryptographic Key destruction – ECDSA (Elliptic Curve Digital Signature Algorithm) This requirement is achieved by TOE hardware reset (FCS_CKM.4/ECDSA). o Cryptographic Key destruction – ECDH (Elliptic Curve Diffie-Hellman) This requirement is achieved by TOE hardware reset (FCS_CKM.4/ECDH). 7.2 Architectural Design Summary 332 The TOE claims the assurance requirement ASE_TSS.2, the security architectural information on a very high level is included in the TSS to inform the embedded software developers on how the TOE protects itself against interference, logical tampering and bypass. 333 Interference 334 Interference consists in interfering in the TSF in order to get access to assets. 335 Logical tampering 336 Logical tampering consists in get access to the assets by a logical means (in contrast with physical tampering). For this TOE, logical tampering may be used on  the access control Public ST Lite_Ver 16.2 7 TOE SUMMARY SPECIFICATION 107/112  the information flow control 337 The access control is enforced by the following security functions: “Security registers access control”, “Invalid address access”, “Access rights for the code executed in FLASH”, “Access control for Operating state”, “Flash protection about Write operation”. 338 The information flow control is enforced by the following security function “Memory Encryption”. 339 Bypass 340 Non-bypassability is a property that the security functionality of the TSF is always invoked. For this TOE, bypassing a security function may be caused by 341 A physical perturbation on the IC: protection against this bypass if ensured by the security functions “Static Address/Data scrambling for bus and memory”, “Synthesizable processor core”, “Detectors”, “Filters” 342 Switching back from Normal mode to Test mode in order to get more privilege: protection against this bypass if ensured by the security functions “Non-reversibility of TEST mode and NORMAL mode” 343 Masking the security errors: protection against this bypass if ensured by the security function “Security registers access control” Public ST Lite_Ver 16.2 8 Annex 108/112 8 Annex 8.1 Glossary Application Data All data managed by the Security IC Embedded Software in the application context. Application data comprise all data in the final Security IC. Composite Product Integrator Role installing or finalising the IC Embedded Software and the applications on platform transforming the TOE into the unpersonalised Composite Product after TOE delivery. The TOE Manufacturer may implement IC Embedded Software delivered by the Security IC Embedded Software Developer before TOE delivery (e.g. if the IC Embedded Software is implemented in ROM or is stored in the non-volatile memory as service provided by the IC Manufacturer or IC Packaging Manufacturer) Composite Product Manufacturer The Composite Product Manufacturer has the following roles (i) the Security IC Embedded Software Developer (Phase 1), (ii) the Composite Product Integrator (Phase 5) and (iii) the Personaliser (Phase 6). If the TOE is delivered after Phase 3 in form of wafers or sawn wafers (dice) he has the role of the IC Packaging Manufacturer (Phase 4) in addition. End-consumer User of the Composite Product in Phase 7. IC Dedicated Software IC proprietary software embedded in a Security IC (also known as IC firmware) and developed by the IC Developer. Such software is required for testing purpose (IC Dedicated Test Software) but may provide additional services to facilitate usage of the hardware and/or to provide additional services (IC Dedicated Support Software). IC Dedicated Test Software That part of the IC Dedicated Software (refer to above) which is used to test the TOE before TOE Delivery but which does not provide any functionality thereafter. IC Dedicated Support Software That part of the IC Dedicated Software (refer to above) which provides functions after TOE Delivery. The usage of parts of the IC Dedicated Software might be restricted to certain phases. Initialisation Data Initialisation Data defined by the TOE Manufacturer to identify the TOE and to keep track of the Security IC’s Public ST Lite_Ver 16.2 8 Annex 109/112 production and further life-cycle phases are considered as belonging to the TSF data. These data are for instance used for traceability and for TOE identification (identification data). Integrated Circuit (IC) Electronic component(s) designed to perform processing and/or memory functions. Pre-personalisation Data Any data supplied by the Card Manufacturer that is injected into the non-volatile memory by the Integrated Circuits manufacturer (Phase 3). These data are for instance used for traceability and/or to secure shipment between phases. Security IC Composition of the TOE, the Security IC Embedded Software, User Data and the package (the Security IC carrier). Security IC Embedded Software Software embedded in a Security IC and normally not being developed by the IC Designer. The Security IC Embedded Software is designed in Phase 1 and embedded into the Security IC in Phase 3 or in later phases of the Security IC product life-cycle. Some part of that software may actually implement a Security IC application others may provide standard services. Nevertheless, this distinction doesn’t matter here so that the Security IC Embedded Software can be considered as being application dependent whereas the IC Dedicated Software is definitely not. Security IC Product Composite product which includes the Security Integrated Circuit (i.e. the TOE) and the Embedded Software and is evaluated as composite target of evaluation in the sense of the Supporting Document TOE Delivery The period when the TOE is delivered which is either (i) after Phase 3 (or before Phase 4) if the TOE is delivered in form of wafers or sawn wafers (dice) or (ii) after Phase 4 (or before Phase 5) if the TOE is delivered in form of packaged products. TOE Manufacturer The TOE Manufacturer must ensure that all requirements for the TOE and its development and production environment are fulfilled. The TOE Manufacturer has the following roles: (i) IC Developer (Phase 2) and (ii) IC Manufacturer (Phase 3). If the TOE is delivered after Phase 4 in form of packaged products, he has the role of the (iii) IC Packaging Manufacturer (Phase 4) in addition. TSF data Data created by and for the TOE, that might affect the operation of the TOE. This includes information about the TOE’s configuration, if any is coded in non-volatile non-programmable memories (ROM), in specific circuitry, in non-volatile programmable memories (for instance E2PROM) or a combination thereof. Public ST Lite_Ver 16.2 8 Annex 110/112 User data All data managed by the Smartcard Embedded Software in the application context. User data comprise all data in the final Smartcard IC except the TSF data. 8.2 Abbreviations CC Common Criteria EAL Evaluation Assurance Level IT Information Technology PP Protection Profile ST Security Target TOE Target of Evaluation TSC TSF Scope of Control TSF TOE Security Functionality TSFI TSF Interface TSP TOE Security Policy Public ST Lite_Ver 16.2 8 Annex 111/112 8.3 References [1] Common Criteria, Part 1: Common Criteria for Information Technology Security Evaluation, Part 1: Introduction and General Model, Version 3.1, Revision 5, April 2017, CCMB-2017-04-001 [2] Common Criteria, Part 2: Common Criteria for Information Technology Security Evaluation, Part 2: Security Functional Components, Version 3.1, Revision 5, April 2017, CCMB-2017-04-002 [3] Common Criteria, Part 3: Common Criteria for Information Technology Security Evaluation, Part 3: Security Assurance Components, Version 3.1, Revision 5, April 2017, CCMB-2017-04-003 [4] Common Methodology for Information Technology Security Evaluation, Evaluation Methodology, Version 3.1, Revision 5, April 2017, CCMB-2017-04-004 [5] Eurosmart Security IC Platform Protection Profile with Augmentation Packages, Version 1.0, BSI-CC-PP-0084- 2014. [6] AIS31: Functionality classes and evaluation methodology for true (physical) random number generators, Version 1, 25.09.2001, Bundesamt für Sicherheit in der Informationstechnik [7] A proposal for: Functionality classes for random number generators, Version 2.0, 18.09.2011, Bundesamt für Sicherheit in der Informationstechnik [8] ALGO: Federal Gazette No 19, Notification in accordance with the Electronic Signatures Act and the Electronic Signatures Ordinance (overview of suitable algorithms), Federal Network Agency for Electricity, Gas, Telecommunications, Post and Railway, 2008-11-17 [9] [NIST SP 800-67] Recommendation for the Triple Data Encryption Algorithm (TDEA) Block Cipher, revised January 2012, National Institute of Standards and Technology [10] Federal Information Processing Standards Publication 197, ADVANCED ENCRYPTION STANDARD (AES), U.S. DEPARTMENT OF COMMERCE/National Institute of Standards and Technology, November 26, 2001 [11] [ISO/IEC 14888-2:2008] - Information technology -- Security techniques-- Digital signatures with appendix -- Part 2: Integer factorization based mechanisms. [12] CC Supporting Document, Mandatory Technical Document, "Application of Attack Potential to Smartcards": version 3.2 (November 2022). [13] [ANS X9.62] American National Standard X9.62-2005, Public Key Cryptography for the Financial Services Industry, The Elliptic Curve Digital Signature Algorithm (ECDSA), November 16, 2005. [14] [ANS X9.63] American National Standard X9.63-2001, Public Key Cryptography for the Financial Services Industry: Key Agreement and Key Transport Using Elliptic Curve Cryptography, November 20, 2001 [15] Federal Information Processing Standards Publication 180-4 SECURE HASH STANDARD U.S. DEPARTMENT OF COMMERCE/National Institute of Standards and Technology, 2011 February, 11 [16] [Brainpool curves] ECC Brainpool Standard Curves and Curve generation, M. Lochter, v1.0, www.ecc- brainpool.org [17] [NIST curves] Federal Information Processing Standards Publication FIPS PUB 180-3, Digital Signature Standard; U.S. department of Commerce / National Institute of Standards and Technology (NIST), June 2009 [18] [SEC-recommended curves] SEC2: Recommended Elliptic Curve Domain Parameters, Certicom Research, v1.0, September 20, 2000. [19] [ETSI TS 102 176-1] Electronic Signatures and Infrastructures (ESI); Algorithms and Parameters for Secure Electronic Signatures; Part 1: Hash functions and asymmetric algorithms, 2007-11, version 2.0.0 [20] [SCA on Prime Gen] T. Finke, M. Gebhardt and W. Schindler, A New Side-Channel Attack on RSA Prime Generation, CHES 2009, LNCS 5747, pp. 141-155, 2009. [21] [NIST curves] Federal Information Processing Standards Publication FIPS PUB 180-3, Digital Signature Standard; U.S. department of Commerce / National Institute of Standards and Technology (NIST), June 2009 Public ST Lite_Ver 16.2 8 Annex 112/112 [22] [SEC-recommended curves] SEC2: Recommended Elliptic Curve Domain Parameters, Certicom Research, v1.0, September 20, 2000. [23] [ETSI TS 102 176-1] Electronic Signatures and Infrastructures (ESI); Algorithms and Parameters for Secure Electronic Signatures; Part 1: Hash functions and asymmetric algorithms, 2007-11, version 2.0.0 [24] [SCA on Prime Gen] T. Finke, M. Gebhardt and W. Schindler, A New Side-Channel Attack on RSA Prime Generation, CHES 2009, LNCS 5747, pp. 141-155, 2009. [25] Règles et recommandations concernant le choix et le dimensionnement des mécanismes cryptographiques. Version 2.04, 01/01/2020, ANSSI. http://www.ssi.gouv.fr/uploads/2021/03/anssi-guide-mecanismes_crypto- 2.04.pdf [26] [NIST SP 800-38A] Recommendation for Block Cipher Modes of Operation, 2001, with Addendum Recommendation for Block Cipher Modes of Operation: Three Variants of Ciphertext Stealing for CBC Mode, October 2010