STMicroelectronics ST31P450 A07 Security Target for composition Common Criteria for IT security evaluation SMD_ST31P450_ST_19_006 Rev A07.1 July 2024 www.st.com BLANK July 2024 SMD_ST31P450_ST_19_006 Rev A07.1 3/76 ST31P450 A07 platform Security Target for composition Common Criteria for IT security evaluation 1 Introduction (ASE_INT) 1.1 Security Target reference 1 Document identification: ST31P450 A07 SECURITY TARGET FOR COMPOSITION. 2 Version number: Rev A07.1, issued in July 2024. 3 Registration: registered at ST Microelectronics under number SMD_ST31P450_ST_19_006. 1.2 TOE reference 4 This document presents the Security Target (ST) of the ST31P450 A07 Security Integrated Circuit (IC), designed on the ST31 platform of STMicroelectronics, with firmware version 3.1.1 and 3.1.2. 5 The precise reference of the Target of Evaluation (TOE) is given in Section 1.4: TOE identification and the security IC features are given in Section 1.6: TOE description. 6 A glossary of terms and abbreviations used in this document is given in Appendix A: Glossary. www.st.com Contents ST31P450 A07 platform Security Target for composition 4/76 SMD_ST31P450_ST_19_006 Contents 1 Introduction (ASE_INT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1 Security Target reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.2 TOE reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.3 Context . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 1.4 TOE identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 1.5 TOE overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 1.6 TOE description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 1.6.1 TOE hardware description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 1.6.2 TOE software description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 1.6.3 TOE documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 1.7 TOE life cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 1.8 TOE environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 1.8.1 TOE Development Environment (Phase 2) . . . . . . . . . . . . . . . . . . . . . . 15 1.8.2 TOE production environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 1.8.3 TOE operational environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 2 Conformance claims (ASE_CCL, ASE_ECD) . . . . . . . . . . . . . . . . . . . . 17 2.1 Common Criteria conformance claims . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 2.2 PP Claims . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 2.2.1 PP Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 2.2.2 PP Additions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 2.2.3 PP Claims rationale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 3 Security problem definition (ASE_SPD) . . . . . . . . . . . . . . . . . . . . . . . . 19 3.1 Description of assets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 3.2 Threats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 3.3 Organisational security policies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 3.4 Assumptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 4 Security objectives (ASE_OBJ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 4.1 Security objectives for the TOE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 4.2 Security objectives for the environment . . . . . . . . . . . . . . . . . . . . . . . . . . 27 4.3 Security objectives rationale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 ST31P450 A07 platform Security Target for composition Contents SMD_ST31P450_ST_19_006 5/76 4.3.1 TOE threat "Abuse of Functionality" . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 4.3.2 TOE threat "Memory Access Violation" . . . . . . . . . . . . . . . . . . . . . . . . . 31 4.3.3 TOE threat "Diffusion of open samples" . . . . . . . . . . . . . . . . . . . . . . . . 31 4.3.4 Organisational security policy "Controlled usage to Loader Functionality" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 4.3.5 Organisational security policy "Additional Specific Security Functionality" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 5 Security requirements (ASE_REQ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 5.1 Security functional requirements for the TOE . . . . . . . . . . . . . . . . . . . . . 33 5.1.1 Security Functional Requirements from the Protection Profile . . . . . . . 36 5.1.2 Additional Security Functional Requirements for the cryptographic services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 5.1.3 Additional Security Functional Requirements for the memories protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 5.1.4 Additional Security Functional Requirements related to the loading and authentication capabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 5.1.5 Additional Security Functional Requirements related to the Secure Diagnostic capabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 5.2 TOE security assurance requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 5.3 Refinement of the security assurance requirements . . . . . . . . . . . . . . . . 46 5.3.1 Refinement regarding functional specification (ADV_FSP) . . . . . . . . . . 46 5.3.2 Refinement regarding test coverage (ATE_COV) . . . . . . . . . . . . . . . . . 47 5.4 Security Requirements rationale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 5.4.1 Rationale for the Security Functional Requirements . . . . . . . . . . . . . . . 48 5.4.2 Additional security objectives are suitably addressed . . . . . . . . . . . . . . 52 5.4.3 Additional security requirements are consistent . . . . . . . . . . . . . . . . . . 55 5.4.4 Dependencies of Security Functional Requirements . . . . . . . . . . . . . . . 56 5.4.5 Rationale for the Assurance Requirements . . . . . . . . . . . . . . . . . . . . . . 59 6 TOE summary specification (ASE_TSS) . . . . . . . . . . . . . . . . . . . . . . . . 61 6.1 Limited fault tolerance (FRU_FLT.2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 6.2 Failure with preservation of secure state (FPT_FLS.1) . . . . . . . . . . . . . . 61 6.3 Limited capabilities (FMT_LIM.1) / Test, Limited capabilities (FMT_LIM.1) / Sdiag, Limited capabilities (FMT_LIM.1) / Loader, Limited availability (FMT_LIM.2) / Test, Limited availability (FMT_LIM.2) / Sdiag & Limited availability (FMT_LIM.2) / Loader . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 6.4 Inter-TSF trusted channel (FTP_ITC.1) / Sdiag . . . . . . . . . . . . . . . . . . . . 62 6.5 Audit review (FAU_SAR.1) / Sdiag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 Contents ST31P450 A07 platform Security Target for composition 6/76 SMD_ST31P450_ST_19_006 6.6 Stored data confidentiality (FDP_SDC.1) . . . . . . . . . . . . . . . . . . . . . . . . . 62 6.7 Stored data integrity monitoring and action (FDP_SDI.2) . . . . . . . . . . . . 62 6.8 Audit storage (FAU_SAS.1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 6.9 Resistance to physical attack (FPT_PHP.3) . . . . . . . . . . . . . . . . . . . . . . . 62 6.10 Basic internal transfer protection (FDP_ITT.1), Basic internal TSF data transfer protection (FPT_ITT.1) & Subset information flow control (FDP_IFC.1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 6.11 Random number generation (FCS_RNG.1) . . . . . . . . . . . . . . . . . . . . . . . 63 6.12 Cryptographic operation: TDES operation (FCS_COP.1) / TDES . . . . . . 63 6.13 Cryptographic operation: AES operation (FCS_COP.1) / AES . . . . . . . . . 63 6.14 Static attribute initialisation (FMT_MSA.3) / Memories . . . . . . . . . . . . . . 63 6.15 Management of security attributes (FMT_MSA.1) / Memories & Specification of management functions (FMT_SMF.1) / Memories . . . . . . . . . . . . . . . . 64 6.16 Subset access control (FDP_ACC.1) / Memories & Security attribute based access control (FDP_ACF.1) / Memories . . . . . . . . . . . . . . . . . . . . . . . . . 64 6.17 Authentication Proof of Identity (FIA_API.1) . . . . . . . . . . . . . . . . . . . . . . . 64 6.18 Inter-TSF trusted channel (FTP_ITC.1) / Loader, Basic data exchange confidentiality (FDP_UCT.1) / Loader, Data exchange integrity (FDP_UIT.1) / Loader & Audit storage (FAU_SAS.1) / Loader . . . . . . . . . . . . . . . . . . . . 64 6.19 Subset access control (FDP_ACC.1) / Loader & Security attribute based access control (FDP_ACF.1) / Loader . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 6.20 Failure with preservation of secure state (FPT_FLS.1) / Loader . . . . . . . 65 6.21 Static attribute initialisation (FMT_MSA.3) / Loader . . . . . . . . . . . . . . . . . 65 6.22 Management of security attributes (FMT_MSA.1) / Loader & Specification of management functions (FMT_SMF.1) / Loader . . . . . . . . . . . . . . . . . . . . 65 6.23 Security roles (FMT_SMR.1) / Loader . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 6.24 Timing of identification (FIA_UID.1) / Loader & Timing of authentication (FIA_UAU.1) / Loader . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 6.25 Audit review (FAU_SAR.1) / Loader . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 7 Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 8 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 Appendix A Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 A.1 Terms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 A.2 Abbreviations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 ST31P450 A07 platform Security Target for composition List of tables SMD_ST31P450_ST_19_006 7/76 List of tables Table 1. TOE components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Table 2. Derivative devices configuration possibilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Table 3. Composite product life cycle phases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Table 4. Summary of security aspects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Table 5. Summary of security objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Table 6. Security Objectives versus Assumptions, Threats or Policies . . . . . . . . . . . . . . . . . . . . . . 30 Table 7. Summary of functional security requirements for the TOE . . . . . . . . . . . . . . . . . . . . . . . . . 33 Table 8. FCS_COP.1 iterations (cryptographic operations) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 Table 9. TOE security assurance requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 Table 10. Impact of EAL5 selection on BSI-CC-PP-0084-2014 refinements . . . . . . . . . . . . . . . . . . . 46 Table 11. Security Requirements versus Security Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 Table 12. Dependencies of security functional requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 Table 13. TOE components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 Table 14. Guidance documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 Table 15. Sites list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 Table 16. Common Criteria. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 Table 17. Protection Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 Table 18. Other standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 Table 19. List of abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 List of figures ST31P450 A07 platform Security Target for composition 8/76 SMD_ST31P450_ST_19_006 List of figures Figure 1. ST31P450 A07 platform block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Figure 2. Security IC Life-Cycle if Security IC Embedded Software is loaded by Security IC Dedicated Software into the programmable non-volatile Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 ST31P450 A07 platform Security Target for composition SMD_ST31P450_ST_19_006 9/76 1.3 Context 7 The Target of Evaluation (TOE) referred to in Section 1.4: TOE identification, is evaluated under the French IT Security Evaluation and Certification Scheme and is developed by the Connected Security sub-group of STMicroelectronics (ST). 8 The assurance level of the performed Common Criteria (CC) IT Security Evaluation is EAL5 augmented by ASE_TSS.2, ALC_DVS.2, ALC_FLR.2 and AVA_VAN.5. 9 The intent of this Security Target is to specify the Security Functional Requirements (SFRs) and Security Assurance Requirements (SARs) applicable to the TOE security ICs, and to summarise their chosen TSF services and assurance measures. 10 This ST claims to be an instantiation of the "Eurosmart - Security IC Platform Protection Profile with Augmentation Packages" (PP) registered and certified under the reference BSI- CC-PP-0084-2014 in the German IT Security Evaluation and Certification Scheme, with the following augmentations: • Addition #1: “Support of Cipher Schemes” from AUG • Addition #4: “Area based Memory Access Control” from AUG • Additions specific to this Security Target, some in compliance with JIL-CC-SRFPDCL and ANSSI-CC-CER/F/06.002. The original text of this PP is typeset as indicated here, its augmentations from AUG as indicated here, and text originating in JIL-CC-SRFPDCL and ANSSI-CC-CER/F/06.002 as indicated here, when they are reproduced in this document. This ST instantiates the following packages from the above mentioned PP: • Authentication of the Security IC • Loader dedicated for usage in secured environment only • Loader dedicated for usage by authorized users only. 11 Extensions introduced in this ST to the SFRs of the Protection Profile (PP) are exclusively drawn from the Common Criteria part 2 standard SFRs. 12 This ST makes various refinements to the above mentioned PP and AUG. They are all properly identified in the text typeset as indicated here or here. The original text of the PP is repeated as scarcely as possible in this document for reading convenience. All PP identifiers have been however prefixed by their respective origin label: BSI for BSI-CC-PP- 0084-2014, AUG1 for Addition #1 of AUG, AUG4 for Addition #4 of AUG., and JIL for JIL- CC-SRFPDCL and ANSSI-CC-CER/F/06.002. 1.4 TOE identification 13 The Target of Evaluation (TOE) is the ST31P450 A07 platform. 14 “ST31P450 A07” completely identifies the TOE including its components listed in Table 1: TOE components, its guidance documentation detailed in Table 14: Guidance documentation, and its development and production sites indicated in Table 15: Sites list. 15 A07 is the version of the evaluated platform. Any change in the TOE components, the guidance documentation and the list of sites leads to a new version of the evaluated platform, thus a new TOE. ST31P450 A07 platform Security Target for composition 10/76 SMD_ST31P450_ST_19_006 16 The IC maskset name is the product hardware identification. The IC version is updated for any change in hardware (i.e. part of the layers of the maskset) or in the OST software. 17 All along the product life, the marking on the die, a set of accessible registers and a set of specific instructions allow the customer to check the product information, providing the identification elements, as listed in Table 1: TOE components, and the configuration elements as detailed in the Data Sheet, referenced in Table 14: Guidance documentation. 1.5 TOE overview 18 Designed for secure ID and banking applications, the TOE is a serial access microcontroller that incorporates the most recent generation of ARM® processors for embedded secure systems. Its SecurCore® SC000™ 32-bit RISC core is built on the Cortex™ M0 core with additional security features to help to protect against advanced forms of attacks. 19 Different derivative devices may be configured depending on the customer needs: • either by ST during the manufacturing or packaging process, • or by the customer during the packaging, or composite product integration, or personnalisation process. 20 They all share the same hardware design and the same maskset (denoted by the Master identification number). The Master identification number is unique for all product configurations. 21 The configuration of the derivative devices can impact the I/O mode, and the available NVM size, as detailed here below: 22 All combinations of different features values are possible and covered by this certification. All possible configurations can vary under a unique IC, and without impact on security. 23 The Master identification number is unique for all product configurations. Each derivative device has a specific Child product identification number, also part of the product information, and specified in the Data Sheet and in the Firmware User Manual, referenced in Table 14. 24 The rest of this document applies to all possible configurations of the TOE, except when a restriction is mentioned. For easier reading, the restrictions are typeset as indicated here. Table 1. TOE components IC Maskset name IC version Master identification number (1) 1. Part of the product information. Firmware version K410A C 0x01F1 3.1.1 and 3.1.2 Table 2. Derivative devices configuration possibilities Features Possible values I/O mode Contact only, Dual mode, Contactless only NVM size 320 or 450 Kbytes ST31P450 A07 platform Security Target for composition SMD_ST31P450_ST_19_006 11/76 25 In a few words, the ST31P450 A07 offers a unique combination of high performances and very powerful features for high level security: • Die integrity, • Monitoring of environmental parameters, • Protection mechanisms against faults, • AIS20/AIS31 class PTG.2 compliant True Random Number Generator, • Hardware 3-key Triple DES accelerator, • Hardware AES accelerator, • ISO/IEC 13239 CRC calculation block, • NExt Step CRYPTography accelerator (NESCRYPT). 1.6 TOE description 1.6.1 TOE hardware description 26 The TOE features hardware accelerators for advanced cryptographic functions, with built-in countermeasures against side channel attacks. 27 The AES (Advanced Encryption Standard [3]) accelerator provides a high-performance implementation of AES-128, AES-192 and AES-256 algorithms. It can operate in Electronic CodeBook (ECB) or Cipher Block Chaining (CBC) modes. 28 The 3-key triple DES accelerator (EDES+) supports efficiently the Triple Data Encryption Standard (TDES [2]), enabling Electronic Code Book (ECB) and Cipher Block Chaining (CBC) modes and DES computation. Note that a triple DES can be performed by a triple DES computation or by 3 single DES computations. 29 The NESCRYPT crypto-processor allows fast and secure implementation of the most popular public key cryptosystems with a high level of performance ([4], [6], [8],[9], [10], [11]). 30 The TOE offers 10 Kbytes of User RAM and up to 450 Kbytes of secure User high-density Flash memory (NVM). 31 As randomness is a key stone in many applications, the ST31P450 A07 features a highly reliable True Random Number Generator (TRNG), compliant with PTG.2 Class of AIS20/AIS31 [1] and directly accessible thru dedicated registers. 32 Three general-purpose timers are available as well as a watchdog timer. 33 The TOE offers a contact serial communication interface fully compatible with the ISO/IEC 7816-3 standard, and a contactless interface including an RF Universal Asynchronous Receiver Transmitter (RF UART), enabling communication up to 848 Kbits/s compatible with the ISO/IEC 14443 Type A and PayPass™ standard. These interfaces can be used simultaneously (dual mode), or the contact interface can be deactivated (see Table 2: Derivative devices configuration possibilities). 34 The detailed features of this TOE are described in the Data Sheet and in the Cortex SC000 Technical Reference Manual, referenced in Table 14. 35 Figure 1 provides an overview of the ST31P450 A07 platform. ST31P450 A07 platform Security Target for composition 12/76 SMD_ST31P450_ST_19_006 Figure 1. ST31P450 A07 platform block diagram 1.6.2 TOE software description 36 The OST ROM contains a Dedicated Software which provides full test capabilities (operating system for test, called "OST"), not accessible by the Security IC Embedded Software (ES), after TOE delivery. 37 The System ROM and ST NVM of the TOE contain a Dedicated Software (Firmware) which provides: • a Secure Flash Loader, enabling to securely and efficiently download the Security IC Embedded Software (ES) into the NVM. It also allows the evaluator to load software into the TOE for test purpose. The Secure Flash Loader is available in Admin configuration. The customer can choose to activate it in any phase of the product life- cycle under highly secured conditions, or to deactivate it definitely at a certain step. • low-level functions called Flash Drivers, enabling the Security IC Embedded Software (ES) to modify and manage the NVM contents. The Flash Drivers are available in User configuration. • a set of protected commands for device testing and product profiling, not intended for the Security IC Embedded Software (ES) usage, and not available in User configuration. • a very reduced set of uncritical commands for basic diagnostic purpose (field return analysis), only reserved to STMicroelectronics. • a set of highly protected commands for secure diagnostic purpose (advanced quality investigations), that can only be activated by the customer and be operated by STMicroelectronics on its own audited sites. This feature is protected by specific strong access control, completed by environmental measures which prevent access to customer assets. Furthermore, it can be permanently deactivated by the customer. ST31P450 A07 platform Security Target for composition SMD_ST31P450_ST_19_006 13/76 38 The Security IC Embedded Software (ES) is in User NVM. Note: The ES is not part of the TOE and is out of scope of the evaluation. 1.6.3 TOE documentation 39 The user guidance documentation, part of the TOE, consists of: • the product Data Sheet and die description, • the product family Security Guidance, • the AIS31 user manuals, • the product family programming manual, • the ARM SC000 Technical Reference Manual, • the Firmware user manual, • the Flash loader installation guide. 40 The complete list of guidance documents is detailed in Table 14. 1.7 TOE life cycle 41 This Security Target is fully conform to the claimed PP. In the following, just a summary and some useful explanations are given. For complete details on the TOE life cycle, please refer to the Eurosmart - Security IC Platform Protection Profile with Augmentation Packages (BSI-CC-PP-0084-2014), section 1.2.3. 42 The composite product life cycle is decomposed into 7 phases. Each of these phases has the very same boundaries as those defined in the claimed Protection Profile. ST31P450 A07 platform Security Target for composition 14/76 SMD_ST31P450_ST_19_006 Figure 2. Security IC Life-Cycle if Security IC Embedded Software is loaded by Security IC Dedicated Software into the programmable non-volatile Memory 43 The life cycle phases are summarized in Table 3. 44 The sites potentially involved in the TOE life cycle are listed in Table 15. 45 The limit of the evaluation corresponds to phases 2, 3 and optionally 4, including the delivery and verification procedures of phase 1, and the TOE delivery either to the IC packaging manufacturer or to the composite product integrator ; procedures corresponding to phases 1, 5, 6 and 7 are outside the scope of this evaluation. 46 In the following, the term "Composite product manufacturing" is uniquely used to indicate phases 1, optionally 4, 5 and 6 all together. This ST also uses the term "Composite product manufacturer" which includes all roles responsible of the TOE during phases 1, optionally 4, 5 and 6. 47 The TOE is delivered after Phase 3 in form of wafers or after Phase 4 in packaged form, depending on the customer’s order. 48 In the following, the term "TOE delivery" is uniquely used to indicate: • after Phase 3 (or before Phase 4) if the TOE is delivered in form of wafers or sawn wafers (dice) or • after Phase 4 (or before Phase 5) if the TOE is delivered in form of packaged products. 49 The TOE is delivered in Admin (aka Issuer) or User configuration. ST31P450 A07 platform Security Target for composition SMD_ST31P450_ST_19_006 15/76 1.8 TOE environment 50 Considering the TOE, three types of environments are defined: • Development environment corresponding to phase 2, • Production environment corresponding to phase 3 and optionally 4, • Operational environment, including phase 1 and from phase 4 or 5 to phase 7. 1.8.1 TOE Development Environment (Phase 2) 51 To ensure security, the environment in which the development takes place is secured with controllable accesses having traceability. Furthermore, all authorised personnel involved fully understand the importance and the strict implementation of defined security procedures. 52 The development begins with the TOE's specification. All parties in contact with sensitive information are required to abide by Non-Disclosure Agreements. 53 Design and development of the IC then follows, together with the dedicated and engineering software and tools development. The engineers use secure computer systems (preventing unauthorised access) to make their developments, simulations, verifications and generation of the TOE's databases. Sensitive documents, files and tools, databases on tapes, and printed circuit layout information are stored in appropriate locked cupboards/safe. Of paramount importance also is the disposal of unwanted data (complete electronic erasures) and documents (e.g. shredding). 54 The development centres possibly involved in the development of the TOE are denoted by the activity “DEV” or “ES-DEV” in Table 15. 55 Table 3. Composite product life cycle phases Phase Name Description 1 Security IC embedded software development security IC embedded software development specification of IC pre-personalization requirements 2 IC development IC design IC dedicated software development 3 IC manufacturing and testing integration and photomask fabrication IC manufacturing IC testing IC pre-personalisation 4 IC packaging security IC packaging (and testing) pre-personalisation if necessary 5 Security IC product finishing process composite product finishing process composite product testing 6 Security IC personalisation composite product personalisation composite product testing 7 Security IC end usage composite product usage by its issuers and consumers ST31P450 A07 platform Security Target for composition 16/76 SMD_ST31P450_ST_19_006 1.8.2 TOE production environment 56 As high volumes of product commonly go through such environments, adequate control procedures are necessary to account for all product at all stages of production. Phase 3 57 Reticules and photomasks are generated from the verified IC databases; the former are used in the silicon Wafer-fab processing. As reticules and photomasks are generated off- site, they are transported and worked on in a secure environment. During the transfer of sensitive data electronically, procedures are established to ensure that the data arrive only at the destination and are not accessible at intermediate stages (e.g. stored on a buffer server where system administrators make backup copies). 58 The authorized sub-contractors potentially involved in the TOE mask manufacturing are denoted by the activity “MASK” in Table 15. 59 Production starts within the Wafer-fab; here the silicon wafers undergo the diffusion processing. Computer tracking at wafer level throughout the process is commonplace. The wafers are then taken into the test area. Testing and pre-personalization of each TOE occurs to assure conformance with the device specification and to load the customer information. 60 The authorized front-end plant possibly involved in the manufacturing of the TOE are denoted by the activity “FE” in Table 15. 61 The authorized EWS plant potentially involved in the testing of the TOE are denoted by the activity “EWS” in Table 15. 62 Wafers are then scribed and broken such as to separate the functional from the non- functional ICs. The latter is discarded in a controlled accountable manner. Phase 4 63 The good ICs are then packaged in phase 4, in a back-end plant. When testing, programming or deliveries are done offsite, ICs are transported and worked on in a secure environment with accountability and traceability of all (good and bad) products. 64 When the product is delivered after phase 4, the authorized back-end plants possibly involved in the packaging of the TOE are denoted by the activity “BE” in Table 15. 65 All sites denoted by the activity “WHS” or “WHSD” in Table 15 can be involved for the logistics during phase 3 or 4. 1.8.3 TOE operational environment 66 A TOE operational environment is the environment of phases 1, optionally 4, then 5 to 7. 67 At phases 1, 4, 5 and 6, the TOE operational environment is a controlled environment. 68 End-user environments (phase 7): composite products are used in a wide range of applications to assure authorised conditional access. Examples of such are pay-TV, banking cards, brand protection, portable communication SIM cards, health cards, transportation cards, access management, identity and passport cards. The end-user environment therefore covers a wide range of very different functions, thus making it difficult to avoid and monitor any abuse of the TOE. ST31P450 A07 platform Security Target for composition Conformance claims (ASE_CCL, ASE_- SMD_ST31P450_ST_19_006 17/76 2 Conformance claims (ASE_CCL, ASE_ECD) 2.1 Common Criteria conformance claims 69 The ST31P450 A07 platform Security Target claims to be conformant to the Common Criteria version 3.1 revision 5. 70 Furthermore it claims to be CC Part 2 (CCMB-2017-04-002 R5) extended and CC Part 3 (CCMB-2017-04-003 R5) conformant. 71 The extended Security Functional Requirements are those defined in the Eurosmart - Security IC Platform Protection Profile with Augmentation Packages (BSI-CC-PP-0084- 2014): • FCS_RNG Generation of random numbers, • FMT_LIM Limited capabilities and availability, • FAU_SAS Audit data storage, • FDP_SDC Stored data confidentiality, • FIA_API Authentication proof of identity. The reader can find their certified definitions in the text of the "BSI-CC-PP-0084-2014" Protection Profile. 72 The assurance level for the ST31P450 A07 platform Security Target is EAL5 augmented by ASE_TSS.2, ALC_DVS.2, ALC_FLR.2 and AVA_VAN.5. 2.2 PP Claims 2.2.1 PP Reference 73 The ST31P450 A07 platform Security Target claims strict conformance to the Eurosmart - Security IC Platform Protection Profile with Augmentation Packages (BSI-CC-PP-0084- 2014), for the part of the TOE covered by this PP (Security IC), as required by this Protection Profile. 74 The following packages have been selected from the BSI-CC-PP-0084-2014: • Package “Authentication of the Security IC”, • Packages for Loader: – Package 1: Loader dedicated for usage in Secured Environment only, – Package 2: Loader dedicated for usage by authorized users only. 2.2.2 PP Additions 75 The main additions operated on the BSI-CC-PP-0084-2014 are: • Addition #4: “Area based Memory Access Control” from AUG, • Addition #1: “Support of Cipher Schemes” from AUG, • Specific additions for the Secure Flash Loader, to comply with JIL-CC-SRFPDCL and ANSSI-CC-CER/F/06.002, • Specific additions for the Secure Diagnostic capability, • Refinement of assurance requirements. Conformance claims (ASE_CCL, ASE_ECD) ST31P450 A07 platform Security Target for composi- 18/76 SMD_ST31P450_ST_19_006 76 All refinements are indicated with type setting text as indicated here, original text from the BSI-CC-PP-0084-2014 being typeset as indicated here and here. Text originating in AUG is typeset as indicated here. Text originating in JIL-CC-SRFPDCL and ANSSI-CC- CER/F/06.002 is typeset as indicated here. 77 The security environment additions relative to the PP are summarized in Table 4. 78 The additional security objectives relative to the PP are summarized in Table 5. 79 A simplified presentation of the TOE Security Policy (TSP) is added. 80 The additional SFRs for the TOE relative to the PP are summarized in Table 7. 81 The additional SARs relative to the PP are summarized in Table 9. 2.2.3 PP Claims rationale 82 The differences between this Security Target security objectives and requirements and those of BSI-CC-PP-0084-2014, to which conformance is claimed, have been identified and justified in Section 4 and in Section 5. They have been recalled in the previous section. 83 In the following, the statements of the security problem definition, the security objectives, and the security requirements are consistent with those of the BSI-CC-PP-0084-2014. 84 The security problem definition presented in Section 3, clearly shows the additions to the security problem statement of the PP. 85 The security objectives rationale presented in Section 4.3 clearly identifies modifications and additions made to the rationale presented in the BSI-CC-PP-0084-2014. 86 Similarly, the security requirements rationale presented in Section 5.4 has been updated with respect to the Protection Profile. 87 All PP requirements have been shown to be satisfied in the extended set of requirements whose completeness, consistency and soundness have been argued in the rationale sections of the present document. ST31P450 A07 platform Security Target for composition Security problem definition (ASE_SPD) SMD_ST31P450_ST_19_006 19/76 3 Security problem definition (ASE_SPD) 88 This section describes the security aspects of the environment in which the TOE is intended to be used and addresses the description of the assets to be protected, the threats, the organisational security policies and the assumptions. 89 Note that the origin of each security aspect is clearly identified in the prefix of its label. Most of these security aspects can therefore be easily found in the Eurosmart - Security IC Platform Protection Profile with Augmentation Packages (BSI-CC-PP-0084-2014), section 3. Only those originating in AUG or in JIL-CC-SRFPDCL / ANSSI-CC-CER/F/06.002, and the ones introduced in this Security Target, are detailed in the following sections. 90 A summary of all these security aspects and their respective conditions is provided in Table 4. 3.1 Description of assets 91 Since this Security Target claims strict conformance to the Eurosmart - Security IC Platform Protection Profile with Augmentation Packages (BSI-CC-PP-0084-2014), the assets defined in section 3.1 of the Protection Profile are applied and the assets regarding threats are clarified in this Security Target. Table 4. Summary of security aspects Label Title TOE threats BSI.T.Leak-Inherent Inherent Information Leakage BSI.T.Phys-Probing Physical Probing BSI.T.Malfunction Malfunction due to Environmental Stress BSI.T.Phys-Manipulation Physical Manipulation BSI.T.Leak-Forced Forced Information Leakage BSI.T.Abuse-Func Abuse of Functionality BSI.T.RND Deficiency of Random Numbers BSI.T.Masquerade-TOE Masquerade the TOE AUG4.T.Mem-Access Memory Access Violation JIL.T.Open-Samples-Diffusion Diffusion of open samples OSPs BSI.P.Process-TOE Protection during TOE Development and Production BSI.P.Lim-Block-Loader Limiting and blocking the loader functionality BSI.P.Ctrl-Loader Controlled usage to Loader Functionality AUG1.P.Add-Functions Additional Specific Security Functionality (Cipher Scheme Support) Assumptions BSI.A.Process-Sec-IC Protection during Packaging, Finishing and Personalisation BSI.A.Resp-Appl Treatment of User Data Security problem definition (ASE_SPD) ST31P450 A07 platform Security Target for composition 20/76 SMD_ST31P450_ST_19_006 92 The assets regarding the threats are: • 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 and product in any form, • the TOE correct operation, • the Security IC Embedded Software, stored in the TOE’s protected memories and in operation, • the security services provided by the TOE for the Security IC Embedded Software, • the cryptographic co-processors for Triple-DES and AES, the random number generator, • the TSF Data. 93 Application note: The TOE providing a functionality for Security IC Embedded Software secure loading into NVM, the ES is considered as User Data being stored in the TOE’s memories at this step, and the Protection Profile corresponding packages are integrated, as well as the requirements from JIL-CC-SRFPDCL. 3.2 Threats 94 The threats are described in the BSI-CC-PP-0084-2014, section 3.2. Only those originating in AUG and ANSSI-CC-CER/F/06.002 are detailed in the following section. BSI.T.Leak-Inherent Inherent Information Leakage BSI.T.Phys-Probing Physical Probing BSI.T.Malfunction Malfunction due to Environmental Stress BSI.T.Phys- Manipulation Physical Manipulation BSI.T.Leak-Forced Forced Information Leakage BSI.T.Abuse-Func Abuse of Functionality BSI.T.RND Deficiency of Random Numbers BSI.T.Masquerade-TOE Masquerade the TOE ST31P450 A07 platform Security Target for composition Security problem definition (ASE_SPD) SMD_ST31P450_ST_19_006 21/76 3.3 Organisational security policies 95 The TOE provides specific security functionality that can be used by the Security IC Embedded Software. In the following specific security functionality is listed which is not derived from threats identified for the TOE’s environment because it can only be decided in the context of the Security IC application, against which threats the Security IC Embedded Software will use the specific security functionality. 96 ST applies the Protection policy during TOE Development and Production (BSI.P.Process- TOE) as specified below. AUG4.T.Mem-Access Memory Access Violation: Parts of the Security IC 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 Security 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 a 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 BSI.T.Abuse-Func but for functions available after TOE delivery), (ii) introduce flaws by forcing operational conditions (refer to BSI.T.Malfunction) and/or by physical manipulation (refer to BSI.T.Phys-Manipulation). This attacker is expected to have a high level potential of attack. JIL.T.Open-Samples- Diffusion Diffusion of open samples: 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. Security problem definition (ASE_SPD) ST31P450 A07 platform Security Target for composition 22/76 SMD_ST31P450_ST_19_006 97 BSI.P.Lim-Block-Loader and BSI.P.Ctrl-Loader are dedicated to the Secure Flash Loader, and described in the BSI-CC-PP-0084-2014 packages “Loader dedicated for usage in secured environment only” and “Loader dedicated for usage by authorized users only”. BSI.P.Ctrl-Loader has been completed in accordance with JIL-CC-SRFPDCL. 98 ST applies the Additional Specific Security Functionality policy (AUG1.P.Add-Functions) as specified below. BSI.P.Process-TOE Identification during TOE Development and Production: An accurate identification is established for the TOE. This requires that each instantiation of the TOE carries this unique identification. BSI.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(1) in order to protect stored data from disclosure and manipulation. 1. Note that blocking the Loader is not required, as only authorized users can use the Loader as stated in BSI.P.Ctrl-Loader. BSI.P.Ctrl-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. The activation of the loaded Additional Code user data is possible if: – integrity and authenticity of the Additional Code user data have been successfully checked; – the loaded Additional Code user data is targeted to the Initial TOE (Identification Data of the Additional Code user data and the Initial TOE will be used for this check). Identification Data of the resulting Final TOE shall identify the Initial TOE and the activated Additional Code user data. Identification Data shall be protected in integrity. Note: Here, the term TOE denotes the TOE itself as well as the composite TOE which both may be maintained by loading of data. AUG1.P.Add-Functions Additional Specific Security Functionality: The TOE shall provide the following specific security functionality to the Security IC Embedded Software: – Triple Data Encryption Standard (TDES), – Advanced Encryption Standard (AES). ST31P450 A07 platform Security Target for composition Security problem definition (ASE_SPD) SMD_ST31P450_ST_19_006 23/76 3.4 Assumptions 99 The following assumptions are described in the BSI-CC-PP-0084-2014, section 3.4. BSI.A.Process-Sec-IC Protection during Packaging, Finishing and Personalisation BSI.A.Resp-Appl Treatment of User Data of the Composite TOE Security objectives (ASE_OBJ) ST31P450 A07 platform Security Target for composition 24/76 SMD_ST31P450_ST_19_006 4 Security objectives (ASE_OBJ) 100 The security objectives of the TOE cover principally the following aspects: • integrity and confidentiality of assets, • protection of the TOE and associated documentation during development and production phases, • provide random numbers, • provide cryptographic support and access control functionality. 101 A summary of all security objectives is provided in Table 5. 102 Note that the origin of each objective is clearly identified in the prefix of its label. Most of these security aspects can therefore be easily found in the BSI-CC-PP-0084-2014, sections 4.1 and 7.3. Only those which have been amended, those originating in AUG, those originating in JIL-CC-SRFPDCL, and the ones introduced in this Security Target, are detailed in the following sections. Table 5. Summary of security objectives Label Title TOE BSI.O.Leak-Inherent Protection against Inherent Information Leakage BSI.O.Phys-Probing Protection against Physical Probing BSI.O.Malfunction Protection against Malfunctions BSI.O.Phys-Manipulation Protection against Physical Manipulation BSI.O.Leak-Forced Protection against Forced Information Leakage BSI.O.Abuse-Func Protection against Abuse of Functionality BSI.O.Identification TOE Identification BSI.O.RND Random Numbers BSI.O.Cap-Avail-Loader Capability and Availability of the Loader BSI.O.Ctrl-Auth-Loader Access control and authenticity for the Loader JIL.O.Prot-TSF-Confidentiality Protection of the confidentiality of the TSF JIL.O.Secure-Load-ACode Secure loading of the Additional Code JIL.O.Secure-AC-Activation Secure activation of the Additional Code JIL.O.TOE-Identification Secure identification of the TOE O.Secure-Load-AMemImage Secure loading of the Additional Memory Image O.MemImage-Identification Secure identification of the Memory Image BSI.O.Authentication Authentication to external entities AUG1.O.Add-Functions Additional Specific Security Functionality AUG4.O.Mem-Access Area based Memory Access Control ST31P450 A07 platform Security Target for composition Security objectives (ASE_OBJ) SMD_ST31P450_ST_19_006 25/76 4.1 Security objectives for the TOE Environments BSI.OE.Resp-Appl Treatment of User Data of the Composite TOE BSI.OE.Process-Sec-IC Protection during composite product manufacturing BSI.OE.Lim-Block-Loader Limitation of capability and blocking the Loader BSI.OE.Loader-Usage Secure communication and usage of the Loader BSI.OE.TOE-Auth External entities authenticating of the TOE OE.Composite-TOE-Id Composite TOE identification OE.TOE-Id TOE identification OE.Enable-Disable-Secure- Diag Enabling or disabling the Secure Diagnostic OE.Secure-Diag-Usage Secure communication and usage of the Secure Diagnostic Table 5. Summary of security objectives (continued) Label Title BSI.O.Leak-Inherent Protection against Inherent Information Leakage BSI.O.Phys-Probing Protection against Physical Probing BSI.O.Malfunction Protection against Malfunctions BSI.O.Phys-Manipulation Protection against Physical Manipulation BSI.O.Leak-Forced Protection against Forced Information Leakage BSI.O.Abuse-Func Protection against Abuse of Functionality BSI.O.Identification TOE Identification BSI.O.RND Random Numbers BSI.O.Cap-Avail-Loader Capability and Availability of the Loader BSI.O.Ctrl-Auth-Loader Access control and authenticity for the Loader BSI.O.Authentication Authentication to external entities JIL.O.Prot-TSF- Confidentiality Protection of the confidentiality of the TSF: 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. Security objectives (ASE_OBJ) ST31P450 A07 platform Security Target for composition 26/76 SMD_ST31P450_ST_19_006 JIL.O.Secure-Load-ACode Secure loading of the Additional Code: The Loader of the Initial TOE shall check an evidence of authenticity and integrity of the loaded Additional Code. The Loader enforces that only the allowed version of the Additional Code can be loaded on the Initial TOE. The Loader shall forbid the loading of an Additional Code not intended to be assembled with the Initial TOE. During the Load Phase of an Additional Code, the TOE shall remain secure. Note: Concretely, the TOE manages the Additional Code as a Memory Image. JIL.O.Secure-AC-Activation Secure activation of the Additional Code: Activation of the Additional Code and update of the Identification Data shall be performed at the same time in an Atomic way. All the operations needed for the code to be able to operate as in the Final TOE shall be completed before activation. If the Atomic Activation is successful, then the resulting product is the Final TOE, otherwise (in case of interruption or incident which prevents the forming of the Final TOE), the Initial TOE shall remain in its initial state or fail secure. JIL.O.TOE-Identification Secure identification of the TOE: The Identification Data identifies the Initial TOE and Additional Code. The TOE provides means to store Identification Data in its non-volatile memory and guarantees the integrity of these data. After Atomic Activation of the Additional Code, the Identification Data of the Final TOE allows identifications of Initial TOE and Additional TOE. The user shall be able to uniquely identify Initial TOE and Additional Code(s) which are embedded in the Final TOE. O.Secure-Load-AMemImage Secure loading of the Additional Memory Image: The Loader of the TOE shall check an evidence of authenticity and integrity of the loaded Memory Image. The Loader enforces that only the allowed version of the Additional Memory Image can be loaded after the Initial Memory Image. The Loader shall forbid the loading of an Additional Memory Image not intended to be assembled with the Initial Memory Image. Note: This objective is similar to JIL.O.Secure-Load-ACode, applied to user data (e.g. embedded software). ST31P450 A07 platform Security Target for composition Security objectives (ASE_OBJ) SMD_ST31P450_ST_19_006 27/76 4.2 Security objectives for the environment 103 Security Objectives for the Security IC Embedded Software development environment (phase 1): 104 Clarification related to “Treatment of User Data of the Composite TOE (BSI.OE.Resp-Appl)”: By definition cipher or plain text data and cryptographic keys are User Data. The Security IC 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. 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 realized in the environment. O.MemImage-Identification Secure identification of the Memory Image: The Identification Data identifies the Initial Memory Image and Additional Memory Image. The TOE provides means to store Identification Data in its non-volatile memory and guarantees the integrity of these data. Storage of the Additional Memory Image and update of the Identification Data shall be performed at the same time in an Atomic way, otherwise (in case of interruption or incident which prevents this alignment), the Memory Image shall remain in its initial state or the TOE shall fail secure. The Identification Data of the Final Memory Image allows identifications of Initial Memory Image and Additional Memory Image. Note: This objective is similar to JIL.O.Secure-AC-Activation and JIL.O.TOE-Identification, applied to user data (e.g. embedded software). AUG1.O.Add-Functions Additional Specific Security Functionality: The TOE must provide the following specific security functionality to the Security IC Embedded Software: – Triple Data Encryption Standard (TDES), – Advanced Encryption Standard (AES). AUG4.O.Mem-Access Area based Memory Access Control: The TOE must provide the Security IC Embedded Software with the capability to define 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. BSI.OE.Resp-Appl Treatment of User Data of the Composite TOE Security objectives (ASE_OBJ) ST31P450 A07 platform Security Target for composition 28/76 SMD_ST31P450_ST_19_006 105 Security Objectives for the operational Environment (phase 4 up to 7): BSI.OE.Process-Sec-IC Protection during composite product manufacturing Up to phase 6 BSI.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, if desired, terminate irreversibly the Loader after intended usage of the Loader. Note that blocking the Loader is not required, as only authorized users can use the Loader as stated in BSI.P.Ctrl-Loader. Up to phase 6 BSI.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 authorized user must organize the maintenance transactions to ensure that the additional code (loaded as data) is able to operate as in the Final composite TOE. The authorized user must manage and associate unique Identification to the loaded data. Up to phase 7 BSI.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. Up to phase 7 OE.Composite-TOE-Id Composite TOE identification: The composite manufacturer must maintain a unique identification of a composite TOE under maintenance. Up to phase 7 OE.TOE-Id TOE identification: The IC manufacturer must maintain a unique identification of the TOE under maintenance. Up to phase 7 ST31P450 A07 platform Security Target for composition Security objectives (ASE_OBJ) SMD_ST31P450_ST_19_006 29/76 4.3 Security objectives rationale 106 The main line of this rationale is that the inclusion of all the security objectives of the BSI- CC-PP-0084-2014 Protection Profile, together with those in AUG, and those introduced in this ST, guarantees that all the security environment aspects identified in Section 3 are addressed by the security objectives stated in this chapter. 107 Thus, it is necessary to show that: • security environment aspects from AUG and from this ST, are addressed by security objectives stated in this chapter, • security objectives from AUG and from this ST, are suitable (i.e. they address security environment aspects), • security objectives from AUG and from this ST, are consistent with the other security objectives stated in this chapter (i.e. no contradictions). 108 The selected augmentations from AUG introduce the following security environment aspects: • TOE threat "Memory Access Violation, (AUG4.T.Mem-Access)", • organisational security policy "Additional Specific Security Functionality, (AUG1.P.Add- Functions)". 109 The augmentation made in this ST introduces the following security environment aspect: • TOE threats "Diffusion of open samples, (JIL.T.Open-Samples-Diffusion)". 110 The justification of the additional policies, additional threats, provided in the next subsections shows that they do not contradict to the rationale already given in the Protection Profile BSI-CC-PP-0084-2014 for the assumptions, policies and threats defined there. OE.Enable-Disable- Secure-Diag Enabling or disabling the Secure Diagnostic: If desired, the Composite Product Manufacturer will enable (or disable) irreversibly the Secure Diagnostic capability, thus enabling the IC manufacturer (or disabling everyone) to exercise the Secure Diagnostic capability. Up to phase 7 OE.Secure-Diag-Usage Secure communication and usage of the Secure Diagnostic: The IC manufacturer must support the trusted communication channel with the TOE by fulfilling the access conditions required by the Secure Diagnostic. The IC manufacturer must manage the Secure Diagnostic transactions so that they cannot be used to disclose critical user data of the Composite TOE, manipulate critical user data of the Composite TOE, manipulate Security IC Embedded Software or bypass, deactivate, change or explore security features or security services of the TOE Up to phase 7 Security objectives (ASE_OBJ) ST31P450 A07 platform Security Target for composition 30/76 SMD_ST31P450_ST_19_006 Table 6. Security Objectives versus Assumptions, Threats or Policies Assumption, Threat or Organisational Security Policy Security Objective Notes BSI.A.Resp-Appl BSI.OE.Resp-Appl Phase 1 BSI.P.Process-TOE BSI.O.Identification Phase 2-3 optional Phase 4 BSI.A.Process-Sec-IC BSI.OE.Process-Sec-IC Phase 5-6 optional Phase 4 BSI.P.Lim-Block-Loader BSI.O.Cap-Avail-Loader BSI.OE.Lim-Block-Loader BSI.P.Ctrl-Loader BSI.O.Ctrl-Auth-Loader JIL.O.Secure-Load-ACode JIL.O.Secure-AC-Activation JIL.O.TOE-Identification O.Secure-Load-AMemImage O.MemImage-Identification BSI.OE.Loader-Usage OE.TOE-Id OE.Composite-TOE-Id AUG1.P.Add-Functions AUG1.O.Add-Functions BSI.T.Leak-Inherent BSI.O.Leak-Inherent BSI.T.Phys-Probing BSI.O.Phys-Probing BSI.T.Malfunction BSI.O.Malfunction BSI.T.Phys-Manipulation BSI.O.Phys-Manipulation BSI.T.Leak-Forced BSI.O.Leak-Forced BSI.T.Abuse-Func BSI.O.Abuse-Func OE.Enable-Disable-Secure-Diag OE.Secure-Diag-Usage BSI.T.RND BSI.O.RND BSI.T.Masquerade-TOE BSI.O.Authentication BSI.OE.TOE-Auth AUG4.T.Mem-Access AUG4.O.Mem-Access JIL.T.Open-Samples-Diffusion JIL.O.Prot-TSF-Confidentiality BSI.O.Leak-Inherent BSI.O.Leak-Forced ST31P450 A07 platform Security Target for composition Security objectives (ASE_OBJ) SMD_ST31P450_ST_19_006 31/76 4.3.1 TOE threat "Abuse of Functionality" 111 The justification related to the threat “Abuse of Functionality, (BSI.T.Abuse-Func)” is as follows: 112 The threat BSI.T.Abuse-Func is directly covered by the security objective BSI.O.Abuse- Func, supported by the security objectives for the operational environment OE.Enable- Disable-Secure-Diag and OE.Secure-Diag-Usage for the particular case of the Secure Diagnostic. Therefore BSI.T.Abuse-Func is covered by these three objectives. 4.3.2 TOE threat "Memory Access Violation" 113 The justification related to the threat “Memory Access Violation, (AUG4.T.Mem-Access)” is as follows: 114 According to AUG4.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 Security IC Embedded Software. Thereby security violations caused by accidental or deliberate access to restricted data (which may include code) can be prevented (refer to AUG4.T.Mem-Access). The threat AUG4.T.Mem-Access is therefore removed if the objective is met. 115 The added objective for the TOE AUG4.O.Mem-Access does not introduce any contradiction in the security objectives for the TOE. 4.3.3 TOE threat "Diffusion of open samples" 116 The justification related to the threat “Diffusion of open samples, (JIL.T.Open-Samples- Diffusion)” is as follows: 117 According to threat JIL.T.Open-Samples-Diffusion, the TOE shall provide protection against attacks using open samples of the TOE to characterize the behavior of the IC and its security functionalities. The objective JIL.O.Prot-TSF-Confidentiality requires protection against disclosure of confidential operations of the Security IC through the use of a dedicated code loaded on open samples. Additionally, BSI.O.Leak-Inherent and BSI.O.Leak-Forced ensures protection against disclosure of confidential data processed in the Security IC. Therefore JIL.T.Open-Samples-Diffusion is covered by these three objectives. 118 The added objective for the TOE JIL.O.Prot-TSF-Confidentiality does not introduce any contradiction in the security objectives for the TOE. 4.3.4 Organisational security policy "Controlled usage to Loader Functionality" 119 The justification related to the organisational security policy "Controlled usage to Loader Functionality, (BSI.P.Ctrl-Loader)” is as follows: 120 As stated in BSI-CC-PP-0084-2014, the organisational security policy “Controlled usage to Loader Functionality (BSI.P.Ctrl-Loader) is implemented by the security objective for the TOE “Access control and authenticity for the Loader (BSI.O.Ctrl-Auth-Loader)” and the security objective for the TOE environment “Secure communication and usage of the Loader (BSI.OE.Loader-Usage)”. The security objectives “Secure loading of the Additional Code (JIL.O.Secure-Load- ACode)”, “Secure activation of the Additional Code (JIL.O.Secure-AC-Activation)”, and ”Secure identification of the TOE (JIL.O.TOE-Identification)” specified by JIL-CC-SRFPDCL Security objectives (ASE_OBJ) ST31P450 A07 platform Security Target for composition 32/76 SMD_ST31P450_ST_19_006 additionally enforce this policy since they require authenticity, atomicity, identification of the loaded additional code, part of the TOE. ”Secure identification of the TOE (JIL.O.TOE- Identification)” is supported by the security objective for the TOE environment “TOE identification (OE.TOE-Id)”. Similarly, the security objectives “Secure loading of the Additional Memory Image (O.Secure-Load-AMemImage)”, and “Secure identification of the Memory Image (O.MemImage-Identification)”, enforce this policy since they require authenticity, atomicity, identification of the loaded additional memory image for the user data (embedded software). ”Secure identification of Memory Image (O.MemImage-Identification)” is supported by the security objective for the TOE environment “Composite TOE identification (OE.Composite- TOE-Id)”. Therefore the policy is covered by these nine objectives. 4.3.5 Organisational security policy "Additional Specific Security Functionality" 121 The justification related to the organisational security policy "Additional Specific Security Functionality, (AUG1.P.Add-Functions)” is as follows: 122 Since AUG1.O.Add-Functions requires the TOE to implement exactly the same specific security functionality as required by AUG1.P.Add-Functions, and in the very same conditions, the organisational security policy is covered by the objective. 123 Nevertheless the security objectives BSI.O.Leak-Inherent, BSI.O.Phys-Probing, , BSI.O.Malfunction, BSI.O.Phys-Manipulation and BSI.O.Leak-Forced define how to implement the specific security functionality required by AUG1.P.Add-Functions. (Note that these objectives support that the specific security functionality is provided in a secure way as expected from AUG1.P.Add-Functions.) Especially BSI.O.Leak-Inherent and BSI.O.Leak-Forced refer to the protection of confidential data (User Data or TSF data) in general. User Data are also processed by the specific security functionality required by AUG1.P.Add-Functions. 124 The added objective for the TOE AUG1.O.Add-Functions does not introduce any contradiction in the security objectives for the TOE. ST31P450 A07 platform Security Target for composition Security requirements (ASE_REQ) SMD_ST31P450_ST_19_006 33/76 5 Security requirements (ASE_REQ) 125 This chapter on security requirements contains a section on security functional requirements (SFRs) for the TOE (Section 5.1), a section on security assurance requirements (SARs) for the TOE (Section 5.2), a section on the refinements of these SARs (Section 5.3) as required by the "BSI-CC-PP-0084-2014" Protection Profile. This chapter includes a section with the security requirements rationale (Section 5.4). 5.1 Security functional requirements for the TOE 126 Security Functional Requirements (SFRs) from the "BSI-CC-PP-0084-2014" Protection Profile (PP) are drawn from CCMB-2017-04-002 R5, except the following SFRs, that are extensions to CCMB-2017-04-002 R5: • FCS_RNG Generation of random numbers, • FMT_LIM Limited capabilities and availability, • FAU_SAS Audit data storage, • FDP_SDC Stored data confidentiality, • FIA_API Authentication proof of identity . The reader can find their certified definitions in the text of the "BSI-CC-PP-0084-2014" Protection Profile. 127 All extensions to the SFRs of the "BSI-CC-PP-0084-2014" Protection Profiles (PPs) are exclusively drawn from CCMB-2017-04-002 R5. 128 All iterations, assignments, selections, or refinements on SFRs have been performed according to section C.4 of CCMB-2017-04-001 R5. They are easily identified in the following text as they appear as indicated here. Note that in order to improve readability, iterations are sometimes expressed within tables. 129 In order to ease the definition and the understanding of these security functional requirements, a simplified presentation of the TOE Security Policy (TSP) is given in the following section. 130 The selected security functional requirements for the TOE, their respective origin and type are summarized in Table 7. Table 7. Summary of functional security requirements for the TOE Label Title Addressing Origin Type FRU_FLT.2 Limited fault tolerance Malfunction BSI-CC-PP- 0084-2014 CCMB-2017-04-002 R5 FPT_FLS.1 Failure with preservation of secure state Security requirements (ASE_REQ) ST31P450 A07 platform Security Target for composition 34/76 SMD_ST31P450_ST_19_006 FMT_LIM.1 / Test Limited capabilities Abuse of Test functionality BSI-CC-PP- 0084-2014 Extended FMT_LIM.2 / Test Limited availability FAU_SAS.1 Audit storage Lack of TOE identification BSI-CC-PP- 0084-2014 Operated FDP_SDC.1 Stored data confidentiality Physical manipulation & probing FDP_SDI.2 Stored data integrity monitoring and action CCMB-2017-04-002 R5 FPT_PHP.3 Resistance to physical attack BSI-CC-PP- 0084-2014 FDP_ITT.1 Basic internal transfer protection Leakage FPT_ITT.1 Basic internal TSF data transfer protection FDP_IFC.1 Subset information flow control FCS_RNG.1 Random number generation Weak cryptographic quality of random numbers BSI-CC-PP- 0084-2014 Operated Extended FCS_COP.1 Cryptographic operation Cipher scheme support AUG #1 Operated CCMB-2017-04-002 R5 FDP_ACC.1 / Memories Subset access control Memory access violation Security Target Operated FDP_ACF.1 / Memories Security attribute based access control AUG #4 Operated FMT_MSA.3 / Memories Static attribute initialisation Correct operation FMT_MSA.1 / Memories Management of security attribute FMT_SMF.1 / Memories Specification of management functions Security Target Operated FIA_API.1 Authentication Proof of Identity Masquerade BSI-CC-PP- 0084-2014 Operated Extended Table 7. Summary of functional security requirements for the TOE (continued) Label Title Addressing Origin Type ST31P450 A07 platform Security Target for composition Security requirements (ASE_REQ) SMD_ST31P450_ST_19_006 35/76 FMT_LIM.1 / Loader Limited capabilities Abuse of Loader functionality BSI-CC-PP- 0084-2014 Operated Extended FMT_LIM.2 / Loader Limited availability FTP_ITC.1 / Loader Inter-TSF trusted channel - Loader Loader violation CCMB-2017-04-002 R5 FDP_UCT.1 / Loader Basic data exchange confidentiality - Loader FDP_UIT.1 / Loader Data exchange integrity - Loader FDP_ACC.1 / Loader Subset access control - Loader FDP_ACF.1 / Loader Security attribute based access control - Loader FMT_MSA.3 / Loader Static attribute initialisation - Loader Correct Loader operation Security Target Operated FMT_MSA.1 / Loader Management of security attribute - Loader FMT_SMR.1 / Loader Security roles - Loader FIA_UID.1 / Loader Timing of identification - Loader FIA_UAU.1 / Loader Timing of authentication - Loader FMT_SMF.1 / Loader Specification of management functions - Loader FPT_FLS.1 / Loader Failure with preservation of secure state - Loader FAU_SAR.1 / Loader Audit review - Loader Lack of TOE identification FAU_SAS.1 / Loader Audit storage - Loader Extended Table 7. Summary of functional security requirements for the TOE (continued) Label Title Addressing Origin Type Security requirements (ASE_REQ) ST31P450 A07 platform Security Target for composition 36/76 SMD_ST31P450_ST_19_006 5.1.1 Security Functional Requirements from the Protection Profile Limited fault tolerance (FRU_FLT.2) 131 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). Failure with preservation of secure state (FPT_FLS.1) 132 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. 133 Refinements: The term “failure” above also covers “circumstances”. The TOE prevents failures for the “circumstances” defined above. Regarding application note 14 of BSI-CC-PP-0084-2014, the secure state is reached by an immediate interrupt or by a reset, depending on the current context. Regarding application note 15 of BSI-CC-PP-0084-2014, the TOE provides information on the operating conditions monitored during Security IC Embedded Software execution and after a warm reset. No audit requirement is however selected in this Security Target. Limited capabilities (FMT_LIM.1) / Test 134 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: Limited capability and availability Policy / Test. Limited availability (FMT_LIM.2) / Test 135 The TSF shall be designed and implemented in a manner that limits their availability so that in conjunction with “Limited capabilities (FMT_LIM.1) / Test” the following policy is enforced: Limited capability and availability Policy / Test. FTP_ITC.1 / Sdiag Inter-TSF trusted channel - Secure Diagnostic Abuse of Secure Diagnostic functionality Security Target Operated CCMB-2017-04-002 R5 FAU_SAR.1 / Sdiag Audit review - Secure Diagnostic FMT_LIM.1 / Sdiag Limited capabilities - Secure Diagnostic Extended FMT_LIM.2 / Sdiag Limited availability - Secure Diagnostic Table 7. Summary of functional security requirements for the TOE (continued) Label Title Addressing Origin Type ST31P450 A07 platform Security Target for composition Security requirements (ASE_REQ) SMD_ST31P450_ST_19_006 37/76 136 SFP_1: Limited capability and availability Policy / Test 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. Audit storage (FAU_SAS.1) 137 The TSF shall provide the test process before TOE Delivery with the capability to store the Initialisation Data and/or Pre-personalisation Data and/or supplements of the Security IC Embedded Software in the NVM. Stored data confidentiality (FDP_SDC.1) 138 The TSF shall ensure the confidentiality of the information of the user data while it is stored in all the memory areas where it can be stored. Stored data integrity monitoring and action (FDP_SDI.2) 139 The TSF shall monitor user data stored in containers controlled by the TSF for integrity errors on all objects, based on the following attributes: user data stored in all possible memory areas, depending on the integrity control attributes. 140 Upon detection of a data integrity error, the TSF shall signal the error and react. Resistance to physical attack (FPT_PHP.3) 141 The TSF shall resist physical manipulation and physical probing, to the TSF by responding automatically such that the SFRs are always enforced. 142 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. Basic internal transfer protection (FDP_ITT.1) 143 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. Basic internal TSF data transfer protection (FPT_ITT.1) 144 The TSF shall protect TSF data from disclosure when it is transmitted between separate parts of the TOE. 145 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. Security requirements (ASE_REQ) ST31P450 A07 platform Security Target for composition 38/76 SMD_ST31P450_ST_19_006 Subset information flow control (FDP_IFC.1) 146 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. 147 SFP_2: Data Processing Policy 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 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. Random number generation (FCS_RNG.1) 148 The TSF shall provide a physical random number generator that implements: • (PTG.2.1) A total failure test detects a total failure of entropy source immediately when the RNG has started. When a total failure is detected, no random numbers will be output. • (PTG.2.2) If a total failure of the entropy source occurs while the RNG is being operated, the RNG prevents the output of any internal random number that depends on some raw random numbers that have been generated after the total failure of the entropy source. • (PTG.2.3) The online test shall detect non-tolerable statistical defects of the raw random number sequence (i) immediately when the RNG has started, and (ii) while the RNG is being operated. The TSF must not output any random numbers before the power-up online test has finished successfully or when a defect has been detected. • (PTG.2.4) The online test procedure shall be effective to detect non-tolerable weaknesses of the random numbers soon. • (PTG.2.5) The online test procedure checks the quality of the raw random number sequence. It is triggered externally. The online test is suitable for detecting non- tolerable statistical defects of the statistical properties of the raw random numbers within an acceptable period of time. 149 The TSF shall provide octets of bits that meet • (PTG.2.6) Test procedure A does not distinguish the internal random numbers from output sequences of an ideal RNG. • (PTG.2.7) The average Shannon entropy per internal random bit exceeds 0.997. 5.1.2 Additional Security Functional Requirements for the cryptographic services Cryptographic operation (FCS_COP.1) 150 The TSF shall perform the operations in Table 8 in accordance with a specified cryptographic algorithm in Table 8 and cryptographic key sizes of Table 8 that meet the standards in Table 8. ST31P450 A07 platform Security Target for composition Security requirements (ASE_REQ) SMD_ST31P450_ST_19_006 39/76 5.1.3 Additional Security Functional Requirements for the memories protection 151 The following SFRs are extensions to "BSI-CC-PP-0084-2014" Protection Profile (PP), related to the memories protection. Static attribute initialisation (FMT_MSA.3) / Memories 152 The TSF shall enforce the Memory Access Control Policy to provide minimally protective(a) default values for security attributes that are used to enforce the SFP. 153 The TSF shall allow none to specify alternative initial values to override the default values when an object or information is created. Management of security attributes (FMT_MSA.1) / Memories 154 The TSF shall enforce the Memory Access Control Policy to restrict the ability to modify the security attributes: • Location of the Protected Application code and data to Nobody, • Location of the Protected Sectors to Anybody. Subset access control (FDP_ACC.1) / Memories 155 The TSF shall enforce the Memory Access Control Policy on the Protected Application code and data, Protected sectors. Security attribute based access control (FDP_ACF.1) / Memories 156 The TSF shall enforce the Memory Access Control Policy to objects based on the following: Protected Application code and data, Protected sectors. Table 8. FCS_COP.1 iterations (cryptographic operations) Iteration label [assignment: list of cryptographic operations] [assignment: cryptographic algorithm] [assignment: cryptographic key sizes] [assignment: list of standards] TDES * encryption * decryption - in Cipher Block Chaining (CBC) mode - in Electronic Code Book (ECB) mode Triple Data Encryption Standard 168 bits NIST SP 800-67 NIST SP 800-38A AES * encryption (cipher) * decryption (inverse cipher) - in Cipher Block Chaining (CBC) mode - in Electronic Code Book (ECB) mode Advanced Encryption Standard 128, 192 and 256 bits FIPS PUB 197 a. See the Datasheet referenced in Section 7 for actual values. Security requirements (ASE_REQ) ST31P450 A07 platform Security Target for composition 40/76 SMD_ST31P450_ST_19_006 157 The TSF shall enforce the following rules to determine if an operation among controlled subjects and controlled objects is allowed: An application cannot read, write, compare any piece of data or code belonging to the Protected Application, a Protected sector cannot be programmed or erased. 158 The TSF shall explicitly authorise access of subjects to objects based on the following additional rules: None. 159 The TSF shall explicitly deny access of subjects to objects based on the following additional rules: • in User configuration, any access (read, write, execute) to the OST ROM is denied, • in User configuration, any write access to the ST NVM is denied. 160 The following SFP Memory Access Control Policy is defined for the requirement "Security attribute based access control (FDP_ACF.1) / Memories": 161 SFP_3: Memory Access Control Policy 162 Another application cannot read, write, compare any piece of data or code belonging to the Protected Application. A Protected sector cannot be programmed or erased. Application Note: One only application can be protected by the LPU. 163 The TSF shall explicitly deny access of subjects to objects based on the following additional rules: • in User configuration, any access (read, write, execute) to the OST ROM is denied, • in User configuration, any write access to the ST NVM is denied. Specification of management functions (FMT_SMF.1) / Memories 164 The TSF will be able to perform the following management functions: define the protected sectors. 5.1.4 Additional Security Functional Requirements related to the loading and authentication capabilities Authentication Proof of Identity (FIA_API.1) 165 The TSF shall provide a command based on a cryptographic mechanism to prove the identity of the TOE to an external entity. Limited capabilities (FMT_LIM.1) / Loader 166 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: Loader Limited capability Policy. 167 SFP_4: Loader Limited capability Policy 168 Deploying Loader functionality after delivery does not allow stored user data to be disclosed or manipulated by unauthorized user. ST31P450 A07 platform Security Target for composition Security requirements (ASE_REQ) SMD_ST31P450_ST_19_006 41/76 Limited availability (FMT_LIM.2) / Loader 169 The TSF shall be designed and implemented in a manner that limits its availability so that in conjunction with “Limited capabilities (FMT_LIM.1)” the following policy is enforced: Loader Limited availability Policy. 170 SFP_5: Loader Limited availability Policy 171 The TSF prevents deploying the Loader functionality after blocking of the loader. 172 Note: Blocking the loader is just an option. Inter-TSF trusted channel (FTP_ITC.1) / Loader 173 The TSF shall provide a communication channel between itself and another trusted IT product 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. 174 The TSF shall permit another trusted IT product to initiate communication via the trusted channel. 175 The TSF shall initiate communication via the trusted channel for Maintenance transaction. 176 Refinement: In practice, the communication is not initiated by the TSF. Basic data exchange confidentiality (FDP_UCT.1) / Loader 177 The TSF shall enforce the Loader SFP to receive user data in a manner protected from unauthorized disclosure. Data exchange integrity (FDP_UIT.1) / Loader 178 The TSF shall enforce the Loader SFP to receive user data in a manner protected from modification, deletion, insertion errors. 179 The TSF shall be able to determine on receipt of user data, whether modification, deletion, insertion has occurred. Subset access control (FDP_ACC.1) / Loader 180 The TSF shall enforce the Loader SFP on: • the subjects ST Loader, User Loader, and Delegated Loader, • the objects user data in User NVM and ST data in ST NVM, • the operation Maintenance transaction. Security attribute based access control (FDP_ACF.1) / Loader 181 The TSF shall enforce the Loader SFP to objects based on the following: all subjects, objects and attributes defined in the Loader SFP. 182 The TSF shall enforce the following rules to determine if an operation among controlled subjects and controlled objects is allowed: if the user authenticated role is allowed to perform the maintenance transaction and the maintenance transaction is legitimate and the loaded data emanates from an authorized originator. Note that the term “data” also addresses Additional Code, as this code is seen as data by the TSF. Security requirements (ASE_REQ) ST31P450 A07 platform Security Target for composition 42/76 SMD_ST31P450_ST_19_006 183 The TSF shall explicitly authorize access of subjects to objects based on the following additional rules: none. 184 The TSF shall explicitly deny access of subjects to objects based on the following additional rules: none. 185 The following SFP Loader SFP is defined for the requirements “Basic data exchange confidentiality (FDP_UCT.1) / Loader”, “Data exchange integrity (FDP_UIT.1) / Loader”, “Subset access control (FDP_ACC.1) / Loader”, "Security attribute based access control (FDP_ACF.1) / Loader", "Static attribute initialisation (FMT_MSA.3) / Loader", and "Management of security attributes (FMT_MSA.1) / Loader": 186 SFP_6: Loader SFP 187 The TSF must enforce that a maintenance transaction is performed if and only if the user authenticated role is allowed to perform the maintenance transaction and the maintenance transaction is legitimate and the loaded data emanates from an authorized originator. The TSF ruling is done according to a fixed access rights matrix, based on the subject, object and security attributes listed below. The Security Function Policy (SFP) Loader SFP uses the following definitions: • the subjects are the ST Loader, the User Loader, and the Delegated Loader, • the objects are ST NVM and User NVM, • the operation is Maintenance transaction, • the security attributes linked to the subjects are the remaining sessions, the number of consecutive authentication failures, the allowed memory areas, the logging capacity, the transaction identification. Note that subjects are authorized by cryptographic keys. These keys are considered as authentication data and not as security attributes. Failure with preservation of secure state (FPT_FLS.1) / Loader 188 The TSF shall preserve a secure state when the following types of failures occur: the maintenance transaction is incomplete. Static attribute initialisation (FMT_MSA.3) / Loader 189 The TSF shall enforce the Loader SFP to provide restrictive default values for security attributes that are used to enforce the SFP. 190 The TSF shall allow none to specify alternative initial values to override the default values when an object or information is created. Management of security attributes (FMT_MSA.1) / Loader 191 The TSF shall enforce the Loader SFP to restrict the ability to modify the security attributes remaining sessions, transaction identification to the ST Loader or User Loader. ST31P450 A07 platform Security Target for composition Security requirements (ASE_REQ) SMD_ST31P450_ST_19_006 43/76 Specification of management functions (FMT_SMF.1) / Loader 192 The TSF will be able to perform the following management functions: change the role authentication data, change the remaining sessions, block a role, under the Loader SFP. Security roles (FMT_SMR.1) / Loader 193 The TSF shall maintain the roles: ST Loader, User Loader, Delegated Loader, Secure Diagnostic, and Everybody. 194 The TSF shall be able to associate users with roles. Timing of identification (FIA_UID.1) / Loader 195 The TSF shall allow boot, authentication command and non-critical queries on behalf of the user to be performed before the user is identified. 196 The TSF shall require each user to be successfully identified before allowing any other TSF mediated actions on behalf of that user. Timing of authentication (FIA_UAU.1) / Loader 197 The TSF shall allow boot, authentication command and non-critical queries on behalf of the user to be performed before the user is authenticated. 198 The TSF shall require each user to be successfully authenticated before allowing any other TSF mediated actions on behalf of that user. Audit storage (FAU_SAS.1) / Loader 199 The TSF shall provide the Loader with the capability to store the transaction identification of the loaded data in the NVM. 200 Refinement: The TSF shall systematically store the transaction identification provided by the ST Loader or User Loader together with the loaded data. Audit review (FAU_SAR.1) / Loader 201 The TSF shall provide Everybody with the capability to read the Product information and the Identification of the last completed maintenance transaction, if any, from the audit records. 202 The TSF shall provide the audit records in a manner suitable for the user to interpret the information. 5.1.5 Additional Security Functional Requirements related to the Secure Diagnostic capabilities Limited capabilities (FMT_LIM.1) / Sdiag 203 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: Sdiag Limited Capability Policy. 204 SFP_7: Sdiag Limited Capability Policy Security requirements (ASE_REQ) ST31P450 A07 platform Security Target for composition 44/76 SMD_ST31P450_ST_19_006 205 Deploying Secure Diagnostic capability does not allow stored 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. Limited availability (FMT_LIM.2) / Sdiag 206 The TSF shall be designed and implemented in a manner that limits its availability so that in conjunction with “Limited capabilities (FMT_LIM.1)” the following policy is enforced: Sdiag Limited Availability Policy. 207 SFP_8: Sdiag Limited Availability Policy 208 The TSF prevents deploying the Secure Diagnostic capability unless the Secure Diagnostic mode is explicitly enabled by the authorized user. When the Secure Diagnostic capability is deployed, the TSF allows performing only authorized and authentic diagnostic transactions. 209 Refinement: By enabling the Secure Diagnostic capability, the Composite Product Manufacturer gives authority to the IC manufacturer to exercise the Secure Diagnostic capability known to abide by SFP_7. Inter-TSF trusted channel (FTP_ITC.1) / Sdiag 210 The TSF shall provide a communication channel between itself and another trusted IT product 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. 211 The TSF shall permit another trusted IT product to initiate communication via the trusted channel. 212 The TSF shall initiate communication via the trusted channel for Secure Diagnostic transaction. 213 Refinement: In practice, the communication is initiated by the trusted IT product. Audit review (FAU_SAR.1) / Sdiag 214 The TSF shall provide Everybody with the capability to read the Secure Diagnostic enable status, from the audit records. 215 The TSF shall provide the audit records in a manner suitable for the user to interpret the information. 5.2 TOE security assurance requirements 216 Security Assurance Requirements for the TOE for the evaluation of the TOE are those taken from the Evaluation Assurance Level 5 (EAL5) and augmented by taking the following components: • ASE_TSS.2, ALC_FLR.2, ALC_DVS.2 and AVA_VAN.5. 217 Regarding application note 22 of BSI-CC-PP-0084-2014, the continuously increasing maturity level of evaluations of Security ICs justifies the selection of a higher-level assurance package. ST31P450 A07 platform Security Target for composition Security requirements (ASE_REQ) SMD_ST31P450_ST_19_006 45/76 218 The component ASE_TSS.2 is chosen as an augmentation in this ST to give architectural information on the security functionality of the TOE. 219 The component ALC_FLR.2 is chosen as an augmentation in this ST because a solid flaw management is key for the continuous improvement of the security IC platforms, especially on markets which need highly resistant and long lasting products. 220 The set of security assurance requirements (SARs) is presented in Table 9, indicating the origin of the requirement. Table 9. TOE security assurance requirements Label Title Origin ADV_ARC.1 Security architecture description EAL5/BSI-CC-PP-0084-2014 ADV_FSP.5 Complete semi-formal functional specification with additional error information EAL5 ADV_IMP.1 Implementation representation of the TSF EAL5/BSI-CC-PP-0084-2014 ADV_INT.2 Well-structured internals EAL5 ADV_TDS.4 Semiformal modular design EAL5 AGD_OPE.1 Operational user guidance EAL5/BSI-CC-PP-0084-2014 AGD_PRE.1 Preparative procedures EAL5/BSI-CC-PP-0084-2014 ALC_CMC.4 Production support, acceptance procedures and automation EAL5/BSI-CC-PP-0084-2014 ALC_CMS.5 Development tools CM coverage EAL5 ALC_DEL.1 Delivery procedures EAL5/BSI-CC-PP-0084-2014 ALC_DVS.2 Sufficiency of security measures BSI-CC-PP-0084-2014 ALC_FLR.2 Flaw reporting procedures Security Target ALC_LCD.1 Developer defined life-cycle model EAL5/BSI-CC-PP-0084-2014 ALC_TAT.2 Compliance with implementation standards EAL5 ASE_CCL.1 Conformance claims EAL5/BSI-CC-PP-0084-2014 ASE_ECD.1 Extended components definition EAL5/BSI-CC-PP-0084-2014 ASE_INT.1 ST introduction EAL5/BSI-CC-PP-0084-2014 ASE_OBJ.2 Security objectives EAL5/BSI-CC-PP-0084-2014 ASE_REQ.2 Derived security requirements EAL5/BSI-CC-PP-0084-2014 ASE_SPD.1 Security problem definition EAL5/BSI-CC-PP-0084-2014 ASE_TSS.2 TOE summary specification with architectural design summary Security Target ATE_COV.2 Analysis of coverage EAL5/BSI-CC-PP-0084-2014 ATE_DPT.3 Testing: modular design EAL5 ATE_FUN.1 Functional testing EAL5/BSI-CC-PP-0084-2014 Security requirements (ASE_REQ) ST31P450 A07 platform Security Target for composition 46/76 SMD_ST31P450_ST_19_006 5.3 Refinement of the security assurance requirements 221 As BSI-CC-PP-0084-2014 defines refinements for selected SARs, these refinements are also claimed in this Security Target. 222 The main customizing is that the IC Dedicated Software is an operational part of the TOE after delivery, although it is mainly not available to the user. 223 Regarding application note 23 of BSI-CC-PP-0084-2014, the refinements for all the assurance families have been reviewed for the hierarchically higher-level assurance components selected in this Security Target. 224 The text of the impacted refinements of BSI-CC-PP-0084-2014 is reproduced in the next sections. 225 For reader’s ease, an impact summary is provided in Table 10. 5.3.1 Refinement regarding functional specification (ADV_FSP) 226 Although the IC Dedicated Test Software is a part of the TOE, the test functions of the IC Dedicated Test Software are not described in the Functional Specification because the IC Dedicated Test Software is considered as a test tool delivered with the TOE but not providing security functions for the operational phase of the TOE. The IC Dedicated ATE_IND.2 Independent testing - sample EAL5/BSI-CC-PP-0084-2014 AVA_VAN.5 Advanced methodical vulnerability analysis BSI-CC-PP-0084-2014 Table 9. TOE security assurance requirements (continued) Label Title Origin Table 10. Impact of EAL5 selection on BSI-CC-PP-0084-2014 refinements Assurance Family BSI-CC-PP- 0084-2014 Level ST Level Impact on refinement ALC_DEL 1 1 None ALC_DVS 2 2 None ALC_CMS 4 5 None, refinement is still valid ALC_CMC 4 4 None ADV_ARC 1 1 None ADV_FSP 4 5 Presentation style changes, IC Dedicated Software is included ADV_IMP 1 1 None ATE_COV 2 2 IC Dedicated Software is included AGD_OPE 1 1 None AGD_PRE 1 1 None AVA_VAN 5 5 None ST31P450 A07 platform Security Target for composition Security requirements (ASE_REQ) SMD_ST31P450_ST_19_006 47/76 Software provides security functionalities as soon as the TOE becomes operational (boot software). These are properly identified in the delivered documentation. 227 The Functional Specification refers to datasheet to trace security features that do not provide any external interface but that contribute to fulfil the SFRs e.g. like physical protection. Thereby they are part of the complete instantiation of the SFRs. 228 The Functional Specification refers to design specifications to detail the mechanisms against physical attacks described in a more general way only, but detailed enough to be able to support Test Coverage Analysis also for those mechanisms where inspection of the layout is of relevance or tests beside the TSFI may be needed. 229 The Functional Specification refers to datasheet to specify operating conditions of the TOE. These conditions include but are not limited to the frequency of the clock, the power supply, and the temperature. 230 All functions and mechanisms which control access to the functions provided by the IC Dedicated Test Software (refer to the security functional requirement (FMT_LIM.2)) are part of the Functional Specification. Details will be given in the document for ADV_ARC, refer to Section 6.2.1.5. In addition, all these functions and mechanisms are subsequently be refined according to all relevant requirements of the Common Criteria assurance class ADV because these functions and mechanisms are active after TOE Delivery and need to be part of the assurance aspects Tests (class ATE) and Vulnerability Assessment (class AVA). Therefore, all necessary information is provided to allow tests and vulnerability assessment. 231 Since the selected higher-level assurance component requires a security functional specification presented in a “semi-formal style" (ADV_FSP.5.2C) the changes affect the style of description, the BSI-CC-PP-0084-2014 refinements can be applied with changes covering the IC Dedicated Test Software and are valid for ADV_FSP.5. 5.3.2 Refinement regarding test coverage (ATE_COV) 232 The TOE is tested under different operating conditions within the specified ranges. These conditions include but are not limited to the frequency of the clock, the power supply, and the temperature. This means that “Fault tolerance (FRU_FLT.2)” is proven for the complete TSF. The tests must also cover functions which may be affected by “ageing” (such as EEPROM NVM writing). 233 The existence and effectiveness of measures against physical attacks (as specified by the functional requirement FPT_PHP.3) cannot be tested in a straightforward way. Instead STMicroelectronics provides evidence that the TOE actually has the particular physical characteristics (especially layout design principles). This is done by checking the layout (implementation or actual) in an appropriate way. The required evidence pertains to the existence of mechanisms against physical attacks (unless being obvious). 234 The IC Dedicated Test Software is seen as a “test tool” being delivered as part of the TOE. However, the Test Features do not provide security functionality. Therefore, Test Features need not to be covered by the Test Coverage Analysis but all functions and mechanisms which limit the capability of the functions (cf. FMT_LIM.1) and control access to the functions (cf. FMT_LIM.2) provided by the IC Dedicated Test Software must be part of the Test Coverage Analysis. The IC Dedicated Software provides security functionalities as soon as the TOE becomes operational (boot software). These are part of the Test Coverage Analysis. Security requirements (ASE_REQ) ST31P450 A07 platform Security Target for composition 48/76 SMD_ST31P450_ST_19_006 5.4 Security Requirements rationale 5.4.1 Rationale for the Security Functional Requirements 235 Just as for the security objectives rationale of Section 4.3, the main line of this rationale is that the inclusion of all the security requirements of the BSI-CC-PP-0084-2014 Protection Profile, together with those in AUG, and with those introduced in this Security Target, guarantees that all the security objectives identified in Section 4 are suitably addressed by the security requirements stated in this chapter, and that the latter together form an internally consistent whole. Table 11. Security Requirements versus Security Objectives Security Objective TOE Security Functional and Assurance Requirements BSI.O.Leak-Inherent Basic internal transfer protection FDP_ITT.1 Basic internal TSF data transfer protection FPT_ITT.1 Subset information flow control FDP_IFC.1 BSI.O.Phys-Probing Stored data confidentiality FDP_SDC.1 Resistance to physical attack FPT_PHP.3 BSI.O.Malfunction Limited fault tolerance FRU_FLT.2 Failure with preservation of secure state FPT_FLS.1 BSI.O.Phys-Manipulation Stored data integrity monitoring and action FDP_SDI.2 Resistance to physical attack FPT_PHP.3 BSI.O.Leak-Forced All requirements listed for BSI.O.Leak-Inherent FDP_ITT.1, FPT_ITT.1, FDP_IFC.1 plus those listed for BSI.O.Malfunction and BSI.O.Phys- Manipulation FRU_FLT.2, FPT_FLS.1, FDP_SDI.2, FPT_PHP.3 BSI.O.Abuse-Func Limited capabilities FMT_LIM.1 / Test Limited availability FMT_LIM.2 / Test Limited capabilities - Secure Diagnostic FMT_LIM.1 / Sdiag Limited availability - Secure Diagnostic FMT_LIM.2 / Sdiag Inter-TSF trusted channel - Secure Diagnostic FTP_ITC.1 / Sdiag Audit review - Secure Diagnostic FAU_SAR.1 / Sdiag plus those for BSI.O.Leak-Inherent, BSI.O.Phys-Probing, BSI.O.Malfunction, BSI.O.Phys-Manipulation, BSI.O.Leak-Forced FDP_ITT.1, FPT_ITT.1, FDP_IFC.1, FDP_SDC.1, FDP_SDI.2, FPT_PHP.3, FRU_FLT.2, FPT_FLS.1 BSI.O.Identification Audit storage FAU_SAS.1 BSI.O.RND Random number generation FCS_RNG.1 plus those for BSI.O.Leak-Inherent, BSI.O.Phys-Probing, BSI.O.Malfunction, BSI.O.Phys-Manipulation, BSI.O.Leak-Forced FDP_ITT.1, FPT_ITT.1, FDP_IFC.1, FDP_SDI.2, FDP_SDC.1, FPT_PHP.3, FRU_FLT.2, FPT_FLS.1 BSI.OE.Resp-Appl Not applicable ST31P450 A07 platform Security Target for composition Security requirements (ASE_REQ) SMD_ST31P450_ST_19_006 49/76 BSI.OE.Process-Sec-IC Not applicable BSI.OE.Lim-Block-Loader Not applicable BSI.OE.Loader-Usage Not applicable BSI.OE.TOE-Auth Not applicable OE.Enable-Disable-Secure-Diag Not applicable OE.Secure-Diag-Usage Not applicable BSI.O.Authentication Authentication Proof of Identity FIA_API.1 BSI.O.Cap-Avail-Loader Limited capabilities FMT_LIM.1 / Loader Limited availability FMT_LIM.2 / Loader BSI.O.Ctrl-Auth-Loader “Inter-TSF trusted channel - Loader” FTP_ITC.1 / Loader “Basic data exchange confidentiality - Loader” FDP_UCT.1 / Loader “Data exchange integrity - Loader” FDP_UIT.1 / Loader “Subset access control - Loader” FDP_ACC.1 / Loader “Security attribute based access control - Loader” FDP_ACF.1 / Loader “Static attribute initialisation - Loader” FMT_MSA.3 / Loader “Management of security attribute - Loader” FMT_MSA.1 / Loader “Specification of management functions - Loader” FMT_SMF.1 / Loader “Security roles - Loader” FMT_SMR.1 / Loader “Timing of identification - Loader” FIA_UID.1 / Loader “Timing of authentication - Loader” FIA_UAU.1 / Loader JIL.O.Prot-TSF-Confidentiality “Inter-TSF trusted channel - Loader” FTP_ITC.1 / Loader “Basic data exchange confidentiality - Loader” FDP_UCT.1 / Loader “Data exchange integrity - Loader” FDP_UIT.1 / Loader “Subset access control - Loader” FDP_ACC.1 / Loader “Security attribute based access control - Loader” FDP_ACF.1 / Loader “Static attribute initialisation - Loader” FMT_MSA.3 / Loader “Management of security attribute - Loader” FMT_MSA.1 / Loader “Specification of management functions - Loader” FMT_SMF.1 / Loader “Security roles - Loader” FMT_SMR.1 / Loader “Timing of identification - Loader” FIA_UID.1 / Loader “Timing of authentication - Loader” FIA_UAU.1 / Loader Table 11. Security Requirements versus Security Objectives Security Objective TOE Security Functional and Assurance Requirements Security requirements (ASE_REQ) ST31P450 A07 platform Security Target for composition 50/76 SMD_ST31P450_ST_19_006 JIL.O.Secure-Load-ACode “Inter-TSF trusted channel - Loader” FTP_ITC.1 / Loader “Basic data exchange confidentiality - Loader” FDP_UCT.1 / Loader “Data exchange integrity - Loader” FDP_UIT.1 / Loader “Subset access control - Loader” FDP_ACC.1 / Loader “Security attribute based access control - Loader” FDP_ACF.1 / Loader “Static attribute initialisation - Loader” FMT_MSA.3 / Loader “Management of security attribute - Loader” FMT_MSA.1 / Loader “Specification of management functions - Loader” FMT_SMF.1 / Loader “Security roles - Loader” FMT_SMR.1 / Loader “Timing of identification - Loader” FIA_UID.1 / Loader “Timing of authentication - Loader” FIA_UAU.1 / Loader “Audit storage - Loader” FAU_SAS.1 / Loader JIL.O.Secure-AC-Activation “Failure with preservation of secure state - Loader” FPT_FLS.1 / Loader JIL.O.TOE-Identification “Audit storage - Loader” FAU_SAS.1 / Loader “Audit review - Loader” FAU_SAR.1 / Loader “Stored data integrity monitoring and action” FDP_SDI.2 O.Secure-Load-AMemImage “Inter-TSF trusted channel - Loader” FTP_ITC.1 / Loader “Basic data exchange confidentiality - Loader” FDP_UCT.1 / Loader “Data exchange integrity - Loader” FDP_UIT.1 / Loader “Subset access control - Loader” FDP_ACC.1 / Loader “Security attribute based access control - Loader” FDP_ACF.1 / Loader “Static attribute initialisation - Loader” FMT_MSA.3 / Loader “Management of security attribute - Loader” FMT_MSA.1 / Loader “Specification of management functions - Loader” FMT_SMF.1 / Loader “Security roles - Loader” FMT_SMR.1 / Loader “Timing of identification - Loader” FIA_UID.1 / Loader “Timing of authentication - Loader” FIA_UAU.1 / Loader “Audit storage - Loader” FAU_SAS.1 / Loader O.MemImage-Identification “Failure with preservation of secure state - Loader” FPT_FLS.1 / Loader “Audit storage - Loader” FAU_SAS.1 / Loader “Audit review - Loader” FAU_SAR.1 / Loader “Stored data integrity monitoring and action” FDP_SDI.2 OE.Composite-TOE-Id Not applicable OE.TOE-Id Not applicable Table 11. Security Requirements versus Security Objectives Security Objective TOE Security Functional and Assurance Requirements ST31P450 A07 platform Security Target for composition Security requirements (ASE_REQ) SMD_ST31P450_ST_19_006 51/76 236 As origins of security objectives have been carefully kept in their labelling, and origins of security requirements have been carefully identified in Table 7 and Table 11, it can be verified that the justifications provided by the BSI-CC-PP-0084-2014 Protection Profile and AUG can just be carried forward to their union. 237 From Table 5, it is straightforward to identify additional security objectives for the TOE (AUG1.O.Add-Functions and AUG4.O.Mem-Access) tracing back to AUG, additional objectives (JIL.O.Prot-TSF-Confidentiality, JIL.O.Secure-Load-ACode, JIL.O.Secure-AC- Activation and JIL.O.TOE-Identification) tracing back to JIL-CC-SRFPDCL / ANSSI-CC- CER/F/06.002, and additional objectives (O.Secure-Load-AMemImage, and O.MemImage- Identification) introduced in this Security Target. This rationale must show that security requirements suitably address them all. 238 Furthermore, a careful observation of the requirements listed in Table 7 and Table 11 shows that: • there are security requirements introduced from AUG (FCS_COP.1, FDP_ACC.1 / Memories, FDP_ACF.1 / Memories, FMT_MSA.3 / Memories and FMT_MSA.1 / Memories), • there are additional security requirements introduced by this Security Target (FMT_MSA.3 / Loader, FMT_MSA.1 / Loader, FMT_SMF.1 / Loader, FMT_SMR.1 / Loader, FIA_UID.1 / Loader, FIA_UAU.1 / Loader, FPT_FLS.1 / Loader, FAU_SAS.1 / Loader, FAU_SAR.1 / Loader, FMT_SMF.1 / Memories, FTP_ITC.1 / Sdiag, FAU_SAR.1 / Sdiag, FMT_LIM.1 / Sdiag, FMT_LIM.2 / Sdiag, and various assurance requirements of EAL5+). 239 Though it remains to show that: • security objectives from this Security Target, from JIL-CC-SRFPDCL / ANSSI-CC- CER/F/06.002 and from AUG are addressed by security requirements stated in this chapter, • additional security requirements from this Security Target and from AUG are mutually supportive with the security requirements from the BSI-CC-PP-0084-2014 Protection Profile, and they do not introduce internal contradictions, • all dependencies are still satisfied. 240 The justification that the additional security objectives are suitably addressed, that the additional security requirements are mutually supportive and that, together with those already in BSI-CC-PP-0084-2014, they form an internally consistent whole, is provided in the next subsections. AUG1.O.Add-Functions Cryptographic operation FCS_COP.1 AUG4.O.Mem-Access Subset access control FDP_ACC.1 / Memories Security attribute based access control FDP_ACF.1 / Memories Static attribute initialisation FMT_MSA.3 / Memories Management of security attribute FMT_MSA.1 / Memories Specification of management functions FMT_SMF.1 / Memories Table 11. Security Requirements versus Security Objectives Security Objective TOE Security Functional and Assurance Requirements Security requirements (ASE_REQ) ST31P450 A07 platform Security Target for composition 52/76 SMD_ST31P450_ST_19_006 5.4.2 Additional security objectives are suitably addressed Security objective “Area based Memory Access Control (AUG4.O.Mem- Access)” 241 The justification related to the security objective “Area based Memory Access Control (AUG4.O.Mem-Access)” is as follows: 242 The security functional requirements "Subset access control (FDP_ACC.1) / Memories" and "Security attribute based access control (FDP_ACF.1) / Memories", with the related Security Function Policy (SFP) “Memory Access Control Policy” exactly require to implement an area based memory access control as demanded by AUG4.O.Mem-Access. Therefore, FDP_ACC.1 / Memories and FDP_ACF.1 / Memories with their SFP are suitable to meet the security objective. 243 The security functional requirement "Static attribute initialisation (FMT_MSA.3) / Memories" requires that the TOE provides default values for security attributes. The ability to update the security attributes is restricted to privileged subject(s) as further detailed in the security functional requirement "Management of security attributes (FMT_MSA.1) / Memories". These management functions ensure that the required access control can be realised using the functions provided by the TOE. Security objective “Additional Specific Security Functionality (AUG1.O.Add- Functions)” 244 The justification related to the security objective “Additional Specific Security Functionality (AUG1.O.Add-Functions)” is as follows: 245 The security functional requirements “Cryptographic operation (FCS_COP.1)” exactly requires those functions to be implemented that are demanded by AUG1.O.Add-Functions. Therefore, FCS_COP.1 is suitable to meet the security objective. Security objective “Protection against Abuse of Functionality (BSI.O.Abuse- Func)” 246 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 "Limited availability (FMT_LIM.2) / Test" and "Limited availability (FMT_LIM.2) / Sdiag", and the second one by "Limited capabilities (FMT_LIM.1) / Test" and "Limited capabilities (FMT_LIM.1) / Sdiag". Since these requirements are combined to support the policy, which is suitable to fulfil O.Abuse-Func, these security functional requirements together are suitable to meet the objective. 247 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 Security Functional requirements are also listed in Table 11. Security objective “Access control and authenticity for the Loader (BSI.O.Ctrl- Auth-Loader)” 248 The justification related to the security objective “Access control and authenticity for the Loader (BSI.O.Ctrl-Auth-Loader)” is as follows: ST31P450 A07 platform Security Target for composition Security requirements (ASE_REQ) SMD_ST31P450_ST_19_006 53/76 249 The security functional requirement "Subset access control (FDP_ACC.1) / Loader" defines the subjects, objects and operations of the Loader SFP enforced by the SFR FTP_ITC.1 / Loader, FDP_UCT.1 / Loader, FDP_UIT.1 / Loader and FDP_ACF.1 / Loader. The security functional requirement "Inter-TSF trusted channel (FTP_ITC.1) / Loader" 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. The security functional requirement "Basic data exchange confidentiality (FDP_UCT.1) / Loader" requires the TSF to receive data protected from unauthorized disclosure. The security functional requirement "Data exchange integrity (FDP_UIT.1) / Loader" requires the TSF to verify the integrity and the rightfulness of the received data. The security functional requirement "Security attribute based access control (FDP_ACF.1) / Loader" requires the TSF to implement access control for the Loader functionality. Therefore, FTP_ITC.1 / Loader, FDP_UCT.1 / Loader, FDP_UIT.1 / Loader, FDP_ACC.1 / Loader and FDP_ACF.1 / Loader with their SFP are suitable to meet the security objective. 250 Complementary, the security functional requirement "Static attribute initialisation (FMT_MSA.3) / Loader" requires that the TOE provides default values for security attributes. The ability to update the security attributes is restricted to privileged subject(s) as further detailed in the security functional requirement "Management of security attributes (FMT_MSA.1) / Loader" The security functional requirements "Security roles (FMT_SMR.1) / Loader", "Timing of identification (FIA_UID.1) / Loader" and "Timing of authentication (FIA_UAU.1) / Loader" specify the roles that the TSF recognises and the actions authorized before their identification. The security functional requirement "Specification of management functions (FMT_SMF.1) / Loader" provides additional controlled facility for adapting the loader behaviour to the user’s needs. These management functions ensure that the required access control, associated to the loading feature, can be realized using the functions provided by the TOE. Security objectives “Protection of the confidentiality of the TSF (JIL.O.Prot- TSF-Confidentiality)”, “Secure loading of the Additional Code (JIL.O.Secure- Load-ACode)” and “Secure loading of the Additional Memory Image (O.Secure-Load-AMemImage)” 251 The justification related to the security objectives “Protection of the confidentiality of the TSF (JIL.O.Prot-TSF-Confidentiality)”, “Secure loading of the Additional Code (JIL.O.Secure-Load-ACode)” and “Secure loading of the Additional Memory Image (O.Secure-Load-AMemImage)” is as follows: 252 The security functional requirement "Subset access control (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. The security functional requirement "Inter-TSF trusted channel (FTP_ITC.1) / Loader" 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. The security functional requirement "Basic data exchange confidentiality (FDP_UCT.1) / Loader" requires the TSF to receive data protected from unauthorized disclosure. The security functional requirement "Data exchange integrity (FDP_UIT.1) / Loader" requires the TSF to verify the integrity of the received data. The security functional requirement "Security attribute based access control (FDP_ACF.1) / Loader" requires the TSF to implement access control for the Loader functionality. The security functional requirement "Static attribute initialisation (FMT_MSA.3) / Loader" Security requirements (ASE_REQ) ST31P450 A07 platform Security Target for composition 54/76 SMD_ST31P450_ST_19_006 requires that the TOE provides default values for security attributes. The ability to update the security attributes is restricted to privileged subject(s) as further detailed in the security functional requirement "Management of security attributes (FMT_MSA.1) / Loader". The security functional requirements "Security roles (FMT_SMR.1) / Loader", "Timing of identification (FIA_UID.1) / Loader" and "Timing of authentication (FIA_UAU.1) / Loader" specify the roles that the TSF recognises and the actions authorized before their identification. The security functional requirement "Specification of management functions (FMT_SMF.1) / Loader" provides additional controlled facility for adapting the loader behaviour to the user’s needs. These management functions ensure that the required access control, associated to the loading feature, can be realised using the functions provided by the TOE. The security functional requirement "Audit storage (FAU_SAS.1) / Loader" requires to store the identification data needed to enforce that only the allowed version of the Additional Memory Image can be loaded on the Initial TOE. 253 Therefore, FTP_ITC.1 / Loader, FDP_UCT.1 / Loader, FDP_UIT.1 / Loader, FDP_ACC.1 / Loader, FDP_ACF.1 / Loader together with FMT_MSA.3 / Loader, FMT_MSA.1 / Loader, FMT_SMR.1 / Loader, FMT_SMF.1 / Loader, FIA_UID.1 / Loader, FIA_UAU.1 / Loader, and FAU_SAS.1 / Loader are suitable to meet these security objectives. Security objective “Secure activation of the Additional Code (JIL.O.Secure- AC-Activation)” 254 The justification related to the security objective “Secure activation of the Additional Code (JIL.O.Secure-AC-Activation)” is as follows: 255 The security functional requirement "Audit storage (FAU_SAS.1) / Loader" requires the TSF to fail secure unless the Loading of the Additional Memory Image, including update of the Identification data, is comprehensive, as specified by JIL.O.Secure-AC-Activation. 256 Therefore, FPT_FLS.1 / Loader is suitable to meet this security objective. Security objective “Secure identification of the TOE (JIL.O.TOE-Identification)” 257 The justification related to the security objective “Secure identification of the TOE (JIL.O.TOE-Identification)” is as follows: 258 The security functional requirement "Audit storage (FAU_SAS.1) / Loader" requires the TSF to store the Identification Data of the Memory Images. The security functional requirement "Stored data integrity monitoring and action (FDP_SDI.2)" requires the TSF to detect the integrity errors of the stored data and react in case of detected errors. The security functional requirement "Audit review (FAU_SAR.1) / Loader" allows any user to read this Identification Data. 259 Therefore, FAU_SAS.1 / Loader, and FAU_SAR.1 / Loader together with FDP_SDI.2 are suitable to meet this security objective. Security objective “Secure identification of the Memory Image (O.MemImage- Identification)” 260 The justification related to the security objective “Secure identification of the Memory Image (O.MemImage-Identification)” is as follows: 261 The security functional requirement "Audit storage (FAU_SAS.1) / Loader" requires the TSF to store the Identification Data of the Memory Images. ST31P450 A07 platform Security Target for composition Security requirements (ASE_REQ) SMD_ST31P450_ST_19_006 55/76 The security functional requirement "Stored data integrity monitoring and action (FDP_SDI.2)" requires the TSF to detect the integrity errors of the stored user data and react in case of detected errors. The security functional requirement "Audit review (FAU_SAR.1) / Loader" allows any user to read this Identification Data. The security functional requirement "Audit storage (FAU_SAS.1) / Loader" requires the TSF to fail secure unless the Loading of the Additional Memory Image, including update of the Identification data, is comprehensive, as specified by JIL.O.Secure-AC-Activation. 262 Therefore, FAU_SAS.1 / Loader, FAU_SAR.1 / Loader together with FDP_SDI.2 and FPT_FLS.1 / Loader are suitable to meet this security objective. 5.4.3 Additional security requirements are consistent "Cryptographic operation (FCS_COP.1)" 263 These security requirements have already been argued in Section : Security objective “Additional Specific Security Functionality (AUG1.O.Add-Functions)” above. "Static attribute initialisation (FMT_MSA.3 / Memories), Management of security attributes (FMT_MSA.1 / Memories), Complete access control (FDP_ACC.1 / Memories), Security attribute based access control (FDP_ACF.1 / Memories)" 264 These security requirements have already been argued in Section : Security objective “Area based Memory Access Control (AUG4.O.Mem-Access)” above. "Static attribute initialisation (FMT_MSA.3 / Loader), Management of security attributes (FMT_MSA.1 / Loader), Specification of management function (FMT_SMF.1 / Loader), Security roles (FMT_SMR.1 / Loader), Timing of identification (FIA_UID.1 / Loader), Timing of authentication (FIA_UAU.1 / Loader)" 265 These security requirements have already been argued in Section : Security objective “Protection against Abuse of Functionality (BSI.O.Abuse-Func)” and Section : Security objectives “Protection of the confidentiality of the TSF (JIL.O.Prot-TSF-Confidentiality)”, “Secure loading of the Additional Code (JIL.O.Secure-Load-ACode)” and “Secure loading of the Additional Memory Image (O.Secure-Load-AMemImage)” above. "Audit storage (FAU_SAS.1 / Loader), Audit review (FAU_SAR.1 / Loader)" 266 These security requirements have already been argued in Section : Security objective “Secure identification of the TOE (JIL.O.TOE-Identification)” and Section : Security objective “Secure identification of the Memory Image (O.MemImage-Identification)” above. "Failure with preservation of secure state (FPT_FLS.1 / Loader)" 267 This security requirement has already been argued in Section : Security objective “Secure activation of the Additional Code (JIL.O.Secure-AC-Activation)” and Section : Security objective “Secure identification of the Memory Image (O.MemImage-Identification)” above. Security requirements (ASE_REQ) ST31P450 A07 platform Security Target for composition 56/76 SMD_ST31P450_ST_19_006 "Inter-TSF trusted channel(FTP_ITC.1 / Sdiag), Audit review (FAU_SAR.1 / Sdiag), Limited capabilities (FMT_LIM.1 / Sdiag), Limited availability (FMT_LIM.2 / Sdiag) 268 These security requirements have already been argued in Section : Security objective “Protection against Abuse of Functionality (BSI.O.Abuse-Func)” above. 5.4.4 Dependencies of Security Functional Requirements 269 All dependencies of Security Functional Requirements have been fulfilled in this Security Target except : • those justified in the BSI-CC-PP-0084-2014 Protection Profile security requirements rationale, • those justifed in AUG security requirements rationale, • the dependency of FCS_COP.1 on FDP_ITC.1 or FDP_ITC.2 or FCS_CKM.1 (see discussion below), • the dependency of FCS_COP.1 on FCS_CKM.4 (see discussion below), • the dependency of FAU_SAR.1 / Loader on FAU_GEN.1 (see discussion below), • the dependency of FAU_SAR.1 / Sdiag on FAU_GEN.1 (see discussion below). 270 Details are provided in Table 12 below. Table 12. Dependencies of security functional requirements Label Dependencies Fulfilled by security requirements in this Security Target Dependency already in BSI-CC-PP-0084-2014 or in AUG FRU_FLT.2 FPT_FLS.1 Yes Yes, BSI-CC-PP-0084-2014 FPT_FLS.1 None No dependency Yes, BSI-CC-PP-0084-2014 FMT_LIM.1 / Test FMT_LIM.2 / Test Yes Yes, BSI-CC-PP-0084-2014 FMT_LIM.2 / Test FMT_LIM.1 / Test Yes Yes, BSI-CC-PP-0084-2014 FMT_LIM.1 / Loader FMT_LIM.2 / Loader Yes Yes, BSI-CC-PP-0084-2014 FMT_LIM.2 / Loader FMT_LIM.1 / Loader Yes Yes, BSI-CC-PP-0084-2014 FMT_LIM.1 / Sdiag FMT_LIM.2 / Sdiag Yes Yes, BSI-CC-PP-0084-2014 FMT_LIM.2 / Sdiag FMT_LIM.1 / Sdiag Yes Yes, BSI-CC-PP-0084-2014 FAU_SAS.1 None No dependency Yes, BSI-CC-PP-0084-2014 FDP_SDC.1 None No dependency Yes, BSI-CC-PP-0084-2014 FDP_SDI.2 None No dependency Yes, BSI-CC-PP-0084-2014 FPT_PHP.3 None No dependency Yes, BSI-CC-PP-0084-2014 FDP_ITT.1 FDP_ACC.1 or FDP_IFC.1 Yes Yes, BSI-CC-PP-0084-2014 FPT_ITT.1 None No dependency Yes, BSI-CC-PP-0084-2014 ST31P450 A07 platform Security Target for composition Security requirements (ASE_REQ) SMD_ST31P450_ST_19_006 57/76 FDP_IFC.1 FDP_IFF.1 No, see BSI-CC-PP- 0084-2014 Yes, BSI-CC-PP-0084-2014 FCS_RNG.1 None No dependency Yes, BSI-CC-PP-0084-2014 FCS_COP.1 [FDP_ITC.1 or FDP_ITC.2 or FCS_CKM.1] No, see discussion below Yes, AUG #1 FCS_CKM.4 No, see discussion below FDP_ACC.1 / Memories FDP_ACF.1 / Memories Yes No, CCMB-2017-04-002 R5 FDP_ACF.1 / Memories FDP_ACC.1 / Memories Yes, by FDP_ACC.1 / Memories Yes, AUG #4 FMT_MSA.3 / Memories Yes FMT_MSA.3 / Memories FMT_MSA.1 / Memories Yes Yes, AUG #4 FMT_SMR.1 / Memories No, see AUG #4 FMT_MSA.1 / Memories [FDP_ACC.1 / Memories or FDP_IFC.1] Yes, by FDP_ACC.1 / Memories and FDP_IFC.1 Yes, AUG #4 FMT_SMF.1 / Memories Yes No, CCMB-2017-04-002 R5 FMT_SMR.1 / Memories No, see AUG #4 Yes, AUG #4 FMT_SMF.1 / Memories None No dependency No, CCMB-2017-04-002 R5 FIA_API.1 None No dependency Yes, BSI-CC-PP-0084-2014 FTP_ITC.1 / Loader None No dependency Yes, BSI-CC-PP-0084-2014 FDP_UCT.1 / Loader [FTP_ITC.1 / Loader or FTP_TRP.1 / Loader] Yes, by FTP_ITC.1 / Loader Yes, BSI-CC-PP-0084-2014 [FDP_ACC.1 / Loader or FDP_IFC.1 / Loader] Yes, by FDP_ACC.1 / Loader Table 12. Dependencies of security functional requirements (continued) Label Dependencies Fulfilled by security requirements in this Security Target Dependency already in BSI-CC-PP-0084-2014 or in AUG Security requirements (ASE_REQ) ST31P450 A07 platform Security Target for composition 58/76 SMD_ST31P450_ST_19_006 FDP_UIT.1 / Loader [FTP_ITC.1 / Loader or FTP_TRP.1 / Loader] Yes, by FTP_ITC.1 / Loader Yes, BSI-CC-PP-0084-2014 [FDP_ACC.1 / Loader or FDP_IFC.1 / Loader] Yes, by FDP_ACC.1 / Loader FDP_ACC.1 / Loader FDP_ACF.1 / Loader Yes No, CCMB-2017-04-002 R5 FDP_ACF.1 / Loader FDP_ACC.1 / Loader Yes No, CCMB-2017-04-002 R5 FMT_MSA.3 / Loader Yes FMT_MSA.3 / Loader FMT_MSA.1 / Loader Yes No, CCMB-2017-04-002 R5 FMT_SMR.1 / Loader Yes FMT_MSA.1 / Loader [FDP_ACC.1 / Loader or FDP_IFC.1] Yes No, CCMB-2017-04-002 R5 FDP_SMF.1 / Loader Yes FDP_SMR.1 / Loader Yes FMT_SMR.1 / Loader FIA_UID.1 / Loader Yes No, CCMB-2017-04-002 R5 FIA_UID.1 / Loader None No dependency No, CCMB-2017-04-002 R5 FIA_UAU.1 / Loader FIA_UID.1 / Loader Yes No, CCMB-2017-04-002 R5 FDP_SMF.1 / Loader None No dependency No, CCMB-2017-04-002 R5 FPT_FLS.1 / Loader None No dependency No, CCMB-2017-04-002 R5 FAU_SAS.1 / Loader None No dependency Yes, BSI-CC-PP-0084-2014 FAU_SAR.1 / Loader FAU_GEN.1 No, by FAU_SAS.1 / Loader instead, see discussion below No, CCMB-2017-04-002 R5 FTP_ITC.1 / Sdiag None No dependency No, CCMB-2017-04-002 R5 FAU_SAR.1 / Sdiag FAU_GEN.1 No, see discussion below No, CCMB-2017-04-002 R5 Table 12. Dependencies of security functional requirements (continued) Label Dependencies Fulfilled by security requirements in this Security Target Dependency already in BSI-CC-PP-0084-2014 or in AUG ST31P450 A07 platform Security Target for composition Security requirements (ASE_REQ) SMD_ST31P450_ST_19_006 59/76 271 Part 2 of the Common Criteria defines the dependency of "Cryptographic operation (FCS_COP.1)" on "Import of user data without security attributes (FDP_ITC.1)" or "Import of user data with security attributes (FDP_ITC.2)" or "Cryptographic key generation (FCS_CKM.1)". In this particular TOE, the ES has all possibilities to implement its own creation function, in conformance with its security policy. Therefore, no specific SFR is defined in this ST. 272 Part 2 of the Common Criteria defines the dependency of "Cryptographic operation (FCS_COP.1)" on "Cryptographic key destruction (FCS_CKM.4)". In this particular TOE, there is no specific function for the destruction of the keys. The ES has all possibilities to implement its own destruction function, in conformance with its security policy. Therefore, FCS_CKM.4 is not defined in this ST. 273 Part 2 of the Common Criteria defines the dependency of "Audit review (FAU_SAR.1) / Loader" on "Audit data generation (FAU_GEN.1)". In this particular TOE, "Audit storage (FAU_SAS.1) / Loader" is used to ensure the storage of audit data, because FAU_GEN.1 is too comprehensive to be used in this context. Therefore this dependency is fulfilled by "Audit storage (FAU_SAS.1) / Loader" instead. 274 Part 2 of the Common Criteria defines the dependency of "Audit review (FAU_SAR.1) / Sdiag" on "Audit data generation (FAU_GEN.1)". In this particular TOE, there is no specific function for audit data generation, the data to be audited are just stored. Therefore, FAU_GEN.1 is not defined in this ST. 5.4.5 Rationale for the Assurance Requirements Security assurance requirements added to reach EAL5 (Table 9) 275 Regarding application note 22 of BSI-CC-PP-0084-2014, this Security Target chooses EAL5 with augmentations because developers and users require a high level of independently assured security in a planned development and require a rigorous development approach without incurring unreasonable costs attributable to specialist security engineering techniques. 276 EAL5 represents a meaningful increase in assurance from EAL4 by requiring semiformal design descriptions, a more structured (and hence analyzable) architecture, and improved mechanisms and/or procedures that provide confidence that the TOE will not be tampered during development. 277 The component ALC_FLR.2 is chosen as an augmentation in this ST because a solid flaw management is key for the continuous improvement of the security IC platforms, especially on markets which need highly resistant and long lasting products. 278 The assurance components in an evaluation assurance level (EAL) are chosen in a way that they build a mutually supportive and complete set of components. All dependencies introduced by the requirements chosen for augmentation are fulfilled. Therefore, these components add additional assurance to EAL5, but the mutual support of the requirements and the internal consistency is still guaranteed. 279 Note that detailed and updated refinements for assurance requirements are given in Section 5.3. Dependencies of assurance requirements 280 Dependencies of security assurance requirements are fulfilled by the EAL5 package selection. Security requirements (ASE_REQ) ST31P450 A07 platform Security Target for composition 60/76 SMD_ST31P450_ST_19_006 281 The augmentation to this package identified in paragraph 216 does not introduce dependencies not already satisfied by the EAL5 package, and is considered as consistent augmentation: • ASE_TSS.2 dependencies (ASE_INT.1, ASE_REQ.1 and ADV_ARC.1) are fulfilled by the assurance requirements claimed by this ST. • ALC_FLR.2 has no dependency, • ALC_DVS.2 and AVA_VAN.5 dependencies have been justified in BSI-CC-PP-0084- 2014. ST31P450 A07 platform Security Target for composition TOE summary specification (ASE_TSS) SMD_ST31P450_ST_19_006 61/76 6 TOE summary specification (ASE_TSS) 282 This section demonstrates how the TOE meets each Security Functional Requirement, which will be further detailed in the ADV_FSP and ADV_ARC documents. 6.1 Limited fault tolerance (FRU_FLT.2) 283 The TSF provides limited fault tolerance, by managing a certain number of faults or errors that may happen, related to random number generation, power supply, data flows and cryptographic operations, thus preventing risk of malfunction. 6.2 Failure with preservation of secure state (FPT_FLS.1) 284 The TSF provides preservation of secure state by detecting and managing the following events, resulting in an immediate interruption or reset: • Die integrity violation detection, • Errors on memories, • Glitches, • High voltage supply, • CPU errors, • Sequence control, • etc.. 285 The ES can generate a software reset. 6.3 Limited capabilities (FMT_LIM.1) / Test, Limited capabilities (FMT_LIM.1) / Sdiag, Limited capabilities (FMT_LIM.1) / Loader, Limited availability (FMT_LIM.2) / Test, Limited availability (FMT_LIM.2) / Sdiag & Limited availability (FMT_LIM.2) / Loader 286 The TOE is either in Test, Admin or User configuration. 287 The TOE may also be in Basic Diagnostic (aka Diagnostic), Secure Diagnostic or Genuine Check volatile configuration. 288 The Test and Diagnostics configurations are reserved to ST. 289 The TSF ensures the switching and the control of TOE configuration, the corresponding access control and the control of the corresponding capabilities.The transition controls rely on several strong mechanisms including fuse, authentication and control registers. Part of the transitions are only possible in the STMicroelectronics audited environment. 290 The TSF reduces the available features depending on the TOE configuration. 291 The customer can choose to disable irreversibly the Loading capability. TOE summary specification (ASE_TSS) ST31P450 A07 platform Security Target for composition 62/76 SMD_ST31P450_ST_19_006 292 The customer can choose to irreversibly enable or disable the Secure Diagnostic capability. Only if the customer enables it, for quality investigation purpose, ST can exercise the Secure Diagnostic capability with a secure protocol, in an audited environment. 6.4 Inter-TSF trusted channel (FTP_ITC.1) / Sdiag 293 In Secure Diagnostic volatile configuration, the System Firmware provides a secure channel to allow another IT product to operate a Secure Diagnostic transaction. 6.5 Audit review (FAU_SAR.1) / Sdiag 294 The System Firmware allows to read the Secure Diagnostic status (permanently disabled, permanently enabled, disabled but still configurable). 6.6 Stored data confidentiality (FDP_SDC.1) 295 The TSF ensures confidentiality of the User Data, thanks to the following features: • Memories scrambling and encryption, • Protection of NVM sectors, • LPU. 6.7 Stored data integrity monitoring and action (FDP_SDI.2) 296 The TSF ensures stored data integrity, thanks to the following features: • Memories parity control, • Protection of NVM sectors, • LPU. 6.8 Audit storage (FAU_SAS.1) 297 In User configuration, the TOE provides commands to store data and/or pre-personalisation data and/or supplements of the ES in the NVM. These commands are only available to authorized processes, and only until phase 6. 6.9 Resistance to physical attack (FPT_PHP.3) 298 The TSF ensures resistance to physical tampering, thanks to the following features: • The TOE implements a set of countermeasures that reduce the exploitability of physical probing. • The TOE is physically protected by active shields that command an automatic reaction on die integrity violation detection. ST31P450 A07 platform Security Target for composition TOE summary specification (ASE_TSS) SMD_ST31P450_ST_19_006 63/76 6.10 Basic internal transfer protection (FDP_ITT.1), Basic internal TSF data transfer protection (FPT_ITT.1) & Subset information flow control (FDP_IFC.1) 299 The TSF prevents the disclosure of internal and user data thanks to: • Memories scrambling and encryption, • Bus encryption, • Mechanisms for operation execution concealment, • Leakage protection in libraries. 6.11 Random number generation (FCS_RNG.1) 300 The TSF provides 8-bit true random numbers that can be qualified with the test metrics required by the BSI-AIS20/AIS31 standard for a PTG.2 class device. 6.12 Cryptographic operation: TDES operation (FCS_COP.1) / TDES 301 The TOE provides an EDES+ accelerator that has the capability to perform 3-key Triple DES encryption and decryption in Electronic Code Book (ECB) and Cipher Block Chaining (CBC) mode conformant to NIST SP 800-67 and NIST SP 800-38A. 6.13 Cryptographic operation: AES operation (FCS_COP.1) / AES 302 The AES accelerator provides the following standard AES cryptographic operations for key sizes of 128, 192 and 256 bits, conformant to FIPS PUB 197 with intrinsic counter-measures against attacks: • cipher, • inverse cipher, 303 The AES accelerator can operate in Electronic Code Book (ECB) and Cipher Block Chaining (CBC) mode. 6.14 Static attribute initialisation (FMT_MSA.3) / Memories 304 The TOE enforces a default memory management policy when none other is programmed by the ES. 305 The customer can also use the LPU to protect segments where part of its code and data are stored. TOE summary specification (ASE_TSS) ST31P450 A07 platform Security Target for composition 64/76 SMD_ST31P450_ST_19_006 6.15 Management of security attributes (FMT_MSA.1) / Memories & Specification of management functions (FMT_SMF.1) / Memories 306 The TOE provides memory protections: NVM sector protection, limitation in unprivileged mode, optionally the LPU. 6.16 Subset access control (FDP_ACC.1) / Memories & Security attribute based access control (FDP_ACF.1) / Memories 307 The TOE enforces the memory management policy for data access and code access thanks to a Library Protection Unit (LPU), and for sector protection, programmed by the ES. 308 Overriding the LPU set of access rights, depending on the TOE configuration, the TOE enforces additional protections on specific parts of the memories. 6.17 Authentication Proof of Identity (FIA_API.1) 309 In Admin configuration or Genuine check configuration, the System Firmware provides commands based on a cryptographic mechanism which allows another IT product to check that the TOE is a genuine TOE. 6.18 Inter-TSF trusted channel (FTP_ITC.1) / Loader, Basic data exchange confidentiality (FDP_UCT.1) / Loader, Data exchange integrity (FDP_UIT.1) / Loader & Audit storage (FAU_SAS.1) / Loader 310 In Admin configuration, the System Firmware provides a secure channel to allow another IT product to operate a maintenance transaction. 311 The ciphered data is automatically decrypted then stored in the requested memory. 312 A maintenance transaction can end only after a successful integrity check of the loaded data or an erase. The identification data associated with the memory update is automatically logged during the session, 6.19 Subset access control (FDP_ACC.1) / Loader & Security attribute based access control (FDP_ACF.1) / Loader 313 In Admin configuration, during a maintenance transaction, the System Firmware verifies if the Loader access conditions are satisfied and returns an error when this is not the case. 314 In particular, the additional memory update must be intended to be assembled with the memory update previously loaded. ST31P450 A07 platform Security Target for composition TOE summary specification (ASE_TSS) SMD_ST31P450_ST_19_006 65/76 6.20 Failure with preservation of secure state (FPT_FLS.1) / Loader 315 In Admin configuration, the System Firmware enforces that a maintenance transaction can only end when it is consistent or canceled by an erase. 6.21 Static attribute initialisation (FMT_MSA.3) / Loader 316 In Admin configuration, the System Firmware provides restrictive default values for the Flash Loader security attributes. 6.22 Management of security attributes (FMT_MSA.1) / Loader & Specification of management functions (FMT_SMF.1) / Loader 317 In Admin configuration, the System Firmware provides the capability for an authorized user to change part of the Flash Loader security attributes. 6.23 Security roles (FMT_SMR.1) / Loader 318 The System Firmware supports the assignment of roles to users through the assignment of different keys for the different roles. This allows to distinguish between the roles of ST Loader, User Loader, Delegated Loader, Secure Diagnostic, and Everybody. 6.24 Timing of identification (FIA_UID.1) / Loader & Timing of authentication (FIA_UAU.1) / Loader 319 The System Firmware identifies the user through the key selected for authentication. This is performed by verifying an encryption, thus preventing to unveil the key. 320 After this authentication, both parties share a session key. 321 A limited number of operations is allowed on behalf of the user before the user is identified and authenticated, such as boot, authentication and non-critical queries. 6.25 Audit review (FAU_SAR.1) / Loader 322 In Admin configuration, the System Firmware allows to read the product information and the identification data of all memory updates previously loaded on the TOE. Identification ST31P450 A07 platform Security Target for composition 66/76 SMD_ST31P450_ST_19_006 7 Identification Table 13. TOE components IC Maskset name IC version Master identification number (1) Firmware version K410A C 0x01F1 3.1.1 and 3.1.2 1. Part of the product information. Table 14. Guidance documentation Component description Reference Version Secure dual interface MCU with enhanced security and up to 450 Kbytes of Flash memory- ST31P450 datasheet DS_ST31P450 7 ARM® Cortex SC000 Technical Reference Manual ARM DDI 0456 A ARMv6-M Architecture Reference Manual ARM DDI 0419 C ST31P450 Firmware V3 User Manual UM_ST31P450_FWv3 8 ST31P secure MCU platform Security guidance - Application note AN_SECU_ST31P 2 ST31P platform random number generation - User manual UM_ST31P_TRNG 3 Table 15. Sites list Site Address Activities(1) AMTC / Toppan Dresden Advanced Mask Technology Center Gmbh & Co KG Rahnitzer Allee 9, 01109 Dresden, Germany MASK CHIPBOND JY Chipbond Technology Corporation No. 10, Prosperity 1 Road, Science Park, Hsinchu, Taiwan R.O.C BE CHIPBOND LH Chipbond Technology Corporation No. 3, Li Hsin 5 Road, Science Park, Hsinchu, Taiwan R.O.C BE DNP Dai Nippon Printing Co., Ltd 2-2-1 Kami-Fukuoka, Fujimino-shi Saitama 356-8507 Japan MASK ST31P450 A07 platform Security Target for composition Identification SMD_ST31P450_ST_19_006 67/76 DPE Dai Printing Europe Via C. Olivetti 2/A I-20041 Agrate Italy MASK Feiliks Feili Logistics (Shenzhen) Co., Ltd. Zhongbao Logistics Building, No. 28 Taohua Road, FFTZ, Shenzhen, Guangdong 518038, China WHSD SAMSUNG Giheung Samsung Electronics. Co., Ltd. Samsung-ro, Giheung-gu, Yongin-si, Gyeonggi-do, 17113 Republic of Korea FE SAMSUNG Hwaseong Samsung Electronics. Co., Ltd. Samsungjeonja-ro, Hwaseong-si, Gyeonggi-do, 18448 Republic of Korea MASK SAMSUNG Onyang Samsung Electronics. Co., Ltd. 158 Baebang-ro Baebang-eup Asan-City, Chungcheongnam-Do, Korea WHS SMARTFLEX Smartflex Technology 37A Tampines, Street 92, Singapore 528886 BE ST AMK1 STMicroelectronics 5A Serangoon North Avenue 5 554574 Singapore DEV ST AMK6 STMicroelectronics 18 Ang Mo Kio Industrial park 2 569505 Singapore WHS ST Bouskoura STMicroelectronics 101 Boulevard des Muriers 20180 Bouskoura Maroc BE WHSD ST Calamba STMicroelectronics 9 Mountain Drive, LISP II, Brgy La mesa, CALAMBA, Philippines 4027 BE WHSD Table 15. Sites list (continued) Site Address Activities(1) Identification ST31P450 A07 platform Security Target for composition 68/76 SMD_ST31P450_ST_19_006 ST Catania STMicroelectronics Str. Primosole, 50, 95121 Catania, ITALY DEV ST Crolles STMicroelectronics 850 rue Jean Monnet 38926 Crolles France DEV FE MASK ST Gardanne CMP Georges Charpak 880 Avenue de Mimet 13541 Gardanne France BE ST Grenoble STMicroelectronics 12 rue Jules Horowitz, BP 217 38019 Grenoble Cedex France DEV BE ST Ljubljana STMicroelectronics d.o.o. Ljubljana Tehnoloski park 21, 1000 Ljubljana, Slovenia DEV ST Loyang STMicroelectronics 7 Loyang Drive 508938 Singapore WHSD ST Palermo STMicroelectronics Via Tommaso Marcellini, 8L, 90129 Palermo, ITALY DEV ST Rennes STMicroelectronics 10 rue de Jouanet, ePark 35700 Rennes France DEV ST Rousset STMicroelectronics 190 Avenue Célestin Coq, Z.I. 13106 Rousset Cedex FRANCE DEV EWS WHSD Table 15. Sites list (continued) Site Address Activities(1) ST31P450 A07 platform Security Target for composition Identification SMD_ST31P450_ST_19_006 69/76 STS Shenzhen STS Microelectronics 16 Tao hua Rd., Futian free trade zone Shenzhen P.R. China 518038 BE STS Shenzhen Lab STS Microelectronics 17 Taohua Road, Futian Free trade zone Shenzhen P.R. China 518038 BE ST Sophia STMicroelectronics SKY Sophia, Bât B, 776 Rue Albert CAQUOT, 06410 BIOT, France DEV ST Toa Payoh STMicroelectronics 629 Lorong 4/6 Toa Payoh 319521 Singapore EWS ST Tunis STMicroelectronics Elgazala Technopark, Raoued, Gouvernorat de l’Ariana, PB21, 2088 cedex, Ariana, Tunisia IT TERADYNE Teradyne 200 avenue Olivier Perroy Les portes de Rousset - Bâtiment C 13970 Rousset France EWS UTAC Indonesia PT UTAC Manufacturing Services Indonesia JI Maligi I Lot A1-4, Kawasan Industri KIIC, Sukaluyu, Teluk Jambe Timur, Karawang 41361, Indonesia BE 1. DEV = hardware or software development, FE = front-end manufacturing, EWS = electrical wafer sort and/or pre-perso, BE = back-end manufacturing, MASK = mask manufacturing or mask preparation, WHS = warehouse, WHSD = warehouse delivery, IT = information technology Table 15. Sites list (continued) Site Address Activities(1) References ST31P450 A07 platform Security Target for composition 70/76 SMD_ST31P450_ST_19_006 8 References Table 16. Common Criteria Component description Reference Version Common Criteria for Information Technology Security Evaluation - Part 1: Introduction and general model, April 2017 CCMB-2017-04-001 R5 3.1 Rev 5 Common Criteria for Information Technology Security Evaluation - Part 2: Security functional components, April 2017 CCMB-2017-04-002 R5 3.1 Rev 5 Common Criteria for Information Technology Security Evaluation - Part 3: Security assurance components, April 2017 CCMB-2017-04-003 R5 3.1 Rev 5 Table 17. Protection Profile Component description Reference Version Eurosmart - Security IC Platform Protection Profile with Augmentation Packages BSI-CC-PP-0084-2014 1.0 Table 18. Other standards Ref Identifier Description [1] BSI-AIS20/AIS31 A proposal for: Functionality classes for random number generators, W. Killmann & W. Schindler BSI, Version 2.0, 18-09-2011 [2] NIST SP 800-67 NIST SP 800-67, Recommendation for the Triple Data Encryption Algorithm (TDEA) Block Cipher, revised November 2017, National Institute of Standards and Technology [3] FIPS PUB 197 FIPS PUB 197, Advanced Encryption Standard (AES), National Institute of Standards and Technology, U.S. Department of Commerce, updated May 2023. [4] ISO/IEC 9796-2 ISO/IEC 9796, Information technology - Security techniques - Digital signature scheme giving message recovery - Part 2: Integer factorization based mechanisms, ISO, 2002 [5] NIST SP 800-38A 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 [6] ISO/IEC 14888 ISO/IEC 14888, Information technology - Security techniques - Digital signatures with appendix - Part 1: General (1998), Part 2: Identity-based mechanisms (1999), Part 3: Certificate based mechanisms (2006), ISO [7] AUG Smartcard Integrated Circuit Platform Augmentations, Atmel, Hitachi Europe, Infineon Technologies, Philips Semiconductors, Version 1.0, March 2002. [8] IEEE 1363-2000 IEEE 1363-2000, Standard Specifications for Public Key Cryptography, IEEE, 2000 ST31P450 A07 platform Security Target for composition References SMD_ST31P450_ST_19_006 71/76 [9] IEEE 1363a-2004 IEEE 1363a-2004, Standard Specifications for Public Key Cryptography - Amendment 1:Additional techniques, IEEE, 2004 [10] PKCS #1 V2.1 PKCS #1 V2.1 RSA Cryptography Standard, RSA Laboratories, June 2002 [11] MOV 97 Alfred J. Menezes, Paul C. van Oorschot and Scott A. Vanstone, Handbook of Applied Cryptography, CRC Press, 1997 [12] NIST SP 800-90 NIST Special Publication 800-90, Recommendation for random number generation using deterministic random bit generators (Revised), National Institute of Standards and Technology (NIST), June 2015 [13] JIL-CC-SRFPDCL Security requirements for post-delivery code loading, Joint Interpretation Library, Version 1.0, February 2016 [14] ANSSI-CC- CER/F/06.002 PP0084: Interpretations, ANSSI, April 2016 Table 18. Other standards Ref Identifier Description Glossary ST31P450 A07 platform Security Target for composition 72/76 SMD_ST31P450_ST_19_006 Appendix A Glossary A.1 Terms Authorised user A user who may, in accordance with the TSP, perform an operation. Composite product Security IC product which includes the Security Integrated Circuit (i.e. the TOE) and the Embedded Software and is evaluated as composite target of evaluation. End-consumer User of the Composite Product in Phase 7. Integrated Circuit (IC) Electronic component(s) designed to perform processing and/or memory functions. IC Dedicated Software IC proprietary software embedded in a Security IC (also known as IC firmware) and developed by ST. 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 which is used to test the TOE before TOE Delivery but which does not provide any functionality thereafter. IC developer Institution (or its agent) responsible for the IC development. IC manufacturer Institution (or its agent) responsible for the IC manufacturing, testing, and pre- personalization. IC packaging manufacturer Institution (or its agent) responsible for the IC packaging and testing. 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) Object An entity within the TSC that contains or receives information and upon which subjects perform operations. Packaged IC Security IC embedded in a physical package such as micromodules, DIPs, SOICs or TQFPs. Pre-personalization 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. If "Package 2: Loader dedicated for usage by authorized users only" is used the Pre-personalisation Data ST31P450 A07 platform Security Target for composition Glossary SMD_ST31P450_ST_19_006 73/76 may contain the authentication reference data or key material for the trusted channel between the TOE and the authorized users using the Loader. Secret Information that must be known only to authorised users and/or the TSF in order to enforce a specific SFP. Security IC Composition of the TOE, the Security IC Embedded Software, User Data, and the package. Security IC Embedded SoftWare (ES) Software embedded in the Security IC and not developed by the IC designer. The Security IC Embedded Software is designed in Phase 1 and embedded into the Security IC in Phase 3. Security IC embedded software (ES) developer Institution (or its agent) responsible for the security IC embedded software development and the specification of IC pre-personalization requirements, if any. Security attribute Information associated with subjects, users and/or objects that is used for the enforcement of the TSP. Sensitive information Any information identified as a security relevant element of the TOE such as: – the application data of the TOE (such as IC pre-personalization requirements, IC and system specific data), – the security IC embedded software, – the IC dedicated software, – the IC specification, design, development tools and technology. Smartcard A card according to ISO 7816 requirements which has a non volatile memory and a processing unit embedded within it. Subject An entity within the TSC that causes operations to be performed. Test features All features and functions (implemented by the IC Dedicated Software and/or hardware) which are designed to be used before TOE Delivery only and delivered as part of the TOE. TOE Delivery The period when the TOE is delivered which is after Phase 3 or Phase 4 in this Security target. TSF data Data created by and for the TOE, that might affect the operation of the TOE. User Any entity (human user or external IT entity) outside the TOE that interacts with the TOE. 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. Glossary ST31P450 A07 platform Security Target for composition 74/76 SMD_ST31P450_ST_19_006 A.2 Abbreviations Table 19. List of abbreviations Term Meaning AIS Application notes and Interpretation of the Scheme (BSI). BE Back End manufacturing. BSI Bundesamt für Sicherheit in der Informationstechnik. CBC Cipher Block Chaining. CC Common Criteria Version 3.1. R5. CPU Central Processing Unit. CRC Cyclic Redundancy Check. DCSSI Direction Centrale de la Sécurité des Systèmes d’Information. DES Data Encryption Standard. DEV Development. DIP Dual-In-Line Package. DRBG Deterministic Random Bit Generator. EAL Evaluation Assurance Level. ECB Electronic Code Book. EDES Enhanced DES. EEPROM Electrically Erasable Programmable Read Only Memory. ES Security IC Embedded Software. ES-DEV Libraries Development EWS Electrical Wafer Sort. FE Front End manufacturing. FIPS Federal Information Processing Standard. I/O Input / Output. IC Integrated Circuit. ISO International Standards Organisation. IT Information Technology. LPU Library Protection Unit. MASK Mask manufacturing. NESCRYPT Next Step Cryptography Accelerator. NIST National Institute of Standards and Technology. NVM Non Volatile Memory. OSP Organisational Security Policy. ST31P450 A07 platform Security Target for composition Glossary SMD_ST31P450_ST_19_006 75/76 OST Operating System for Test. PP Protection Profile. PUB Publication Series. RAM Random Access Memory. RF Radio Frequency. RF UART Radio Frequency Universal Asynchronous Receiver Transmitter. ROM Read Only Memory. RSA Rivest, Shamir & Adleman. SAR Security Assurance Requirement. SFP Security Function Policy. SFR Security Functional Requirement. SOIC Small Outline IC. ST Context dependent : STMicroelectronics or Security Target. TDES Triple Data Encryption Standard TOE Target of Evaluation. TQFP Thin Quad Flat Package. TRNG True Random Number Generator. TSC TSF Scope of Control. TSF TOE Security Functionality. TSFI TSF Interface. TSP TOE Security Policy. TSS TOE Summary Specification. WHS Warehouse. WHSD Warehouse Delivery Table 19. List of abbreviations (continued) Term Meaning ST31P450 A07 platform Security Target for composition 76/76 SMD_ST31P450_ST_19_006 IMPORTANT NOTICE – PLEASE READ CAREFULLY STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, enhancements, modifications, and improvements to ST products and/or to this document at any time without notice. Purchasers should obtain the latest relevant information on ST products before placing orders. ST products are sold pursuant to ST’s terms and conditions of sale in place at the time of order acknowledgement. Purchasers are solely responsible for the choice, selection, and use of ST products and ST assumes no liability for application assistance or the design of Purchasers’ products. No license, express or implied, to any intellectual property right is granted by ST herein. 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