PREMIER MINISTRE
General Secretariat for Defence and National Security
French Network and Information Security Agency
Certification Report ANSSI-CC-2010/23
ST23YT66/34A Secure Microcontrollers
Paris, May 11th
2010
Courtesy Translation
Certification report ANSSI-CC-2010/23 ST23YT66/34A Secure Microcontrollers
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Warning
This report is designed to provide sponsors with a document enabling them to assess the
security level of a product under the conditions of use and operation defined in this report for
the evaluated version. It is also designed to provide the potential purchaser of the product with
the conditions under which he may operate or use the product so as to meet the conditions of
use for which the product has been evaluated and certified; that is why this certification report
must be read alongside the evaluated user and administration guidance, as well as with the
product security target, which presents threats, environmental assumptions and the supposed
conditions of use so that the user can judge for himself whether the product meets his needs in
terms of security objectives.
Certification does not, however, constitute a recommendation product from ANSSI (French
Network and Information Security Agency), and does not guarantee that the certified product
is totally free of all exploitable vulnerabilities.
Any correspondence about this report has to be addressed to:
Secrétariat général de la défense et de la sécurité nationale
Agence nationale de la sécurité des systèmes d'information
51, boulevard de la Tour Maubourg
75700 PARIS cedex 07 SP
France
certification.anssi@ssi.gouv.fr
Reproduction of this document without any change or cut is authorised.
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Certification report reference
ANSSI-CC-2010/23
Product name
ST23YT66/34A Secure Microcontrollers
Product reference
ST23YT66/34 revision A (dedicated software APC, K2R0ACB mask set)
Protection profile conformity
BSI-PP-0035-2007 version 1.0
Security IC Platform Protection Profile v1.0, 15 June 2007
Evaluation criteria and version
Common Criteria version 3.1
Evaluation level
EAL 5 augmented
AVA DVS.2, AVA VAN.5
Developer
STMicroelectronics
Smartcard IC division, 190 Avenue Célestin Coq, 13106 Rousset Cedex, France
Sponsor
STMicroelectronics
Smartcard IC division, 190 Avenue Célestin Coq, 13106 Rousset Cedex, France
Evaluation facility
Serma Technologies
30 avenue Gustave Eiffel, 33608 Pessac, France
Phone: +33 (0)5 57 26 08 75, email : e.francois@serma.com
Recognition arrangements
CCRA
The product is recognised at EAL4 level.
SOG-IS
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Introduction
The Certification
Security certification for information technology products and systems is governed by decree
number 2002-535 dated 18 April 2002 and published in the "Journal Officiel de la République
Française". This decree stipulates that:
• The French Network and Information Security Agency draws up certification
reports. These reports indicate the features of the proposed security targets. They may
include any warnings that the authors feel the need to mention for security reasons.
They may or may not be transmitted to third parties or made public, as the sponsors
desire (article 7).
• The certificates issued by the Prime Minister certify that the copies of the products or
systems submitted for evaluation fulfil the specified security features. They also
certify that the evaluations have been carried out in compliance with applicable rules
and standards, with the required degrees of skill and impartiality (article 8).
The procedures are available on the Internet site www.ssi.gouv.fr.
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Content
1. PRODUCT .................................................................................................................................... 6
1.1. PRESENTATION OF THE PRODUCT........................................................................................... 6
1.2. EVALUATED PRODUCT DESCRIPTION ..................................................................................... 6
1.2.1. Product identification........................................................................................................ 6
1.2.2. Security services ................................................................................................................ 7
1.2.3. Architecture ....................................................................................................................... 7
1.2.4. Life cycle............................................................................................................................ 8
1.2.5. Evaluated configuration .................................................................................................. 10
2. EVALUATION........................................................................................................................... 11
2.1. EVALUATION REFERENTIAL ................................................................................................. 11
2.2. EVALUATION WORK ............................................................................................................. 11
2.3. CRYPTOGRAPHIC MECHANISMS ROBUSTNESS ANALYSIS ACCORDING TO ANSSI TECHNICAL
REFERENCE FRAME............................................................................................................................ 11
2.4. RANDOM NUMBER GENERATOR ANALYSIS .......................................................................... 11
3. CERTIFICATION...................................................................................................................... 12
3.1. CONCLUSION........................................................................................................................ 12
3.2. RESTRICTIONS OF USE.......................................................................................................... 12
3.3. RECOGNITION OF THE CERTIFICATE..................................................................................... 12
3.3.1. European recognition (SOG-IS)...................................................................................... 12
3.3.2. International common criteria recognition (CCRA) ....................................................... 13
ANNEX 1. EVALUATION LEVEL OF THE PRODUCT.............................................................. 13
ANNEX 2. EVALUATED PRODUCT REFERENCES.................................................................. 14
ANNEX 3. CERTIFICATION REFERENCES................................................................................ 16
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1. Product
1.1. Presentation of the product
The evaluated products are the ST23YT66 and ST23YT34 secure microcontrollers revision
A (dedicated software APC, K2R0ACB mask set) developed by STMicroelectronics.
The ST23YT66A and ST23YT34A only differ by the logical size of the non volatile
EEPROM and ROM memories. The ST23YT66A (ST23YT34A, respectively) includes a
66Kb EEPROM (34Kb, respectively) and a 210Kb ROM (110Kb, respectively). The physical
size of the EEPROM memory (ROM, respectively) being 66Kb (210Kb, respectively) in both
products. In addition, only the USB interface of the ST23YT66A uses the 1.2 Kb dedicated
RAM in order allow fast data transfers with 512Kb bloc size instead of only 64Kb for
ST23YT34A for which this dedicated RAM is not active even if present on the product.
The microcontrollers aim to host one or several software applications and can be embedded in
a plastic support to create a Smartcard with multiple possible usages (secure identity
documents, banking, health card, pay-TV or transport applications…) depending on the
Embedded Software applications. However, only the microcontroller is evaluated. The
software applications are not in the scope of this evaluation.
1.2. Evaluated product description
The security target [ST] defines the evaluated product, its evaluated security functionalities
and its operational environment.
This security target is compliant with [PP035] protection profile (strict compliance).
1.2.1. Product identification
The configuration list [CONF] identifies the product’s constituent elements.
The certified version of the product can be identified by the following elements:
o Die identification: K2R0A (Die name with HW major cut reference)
o Die mask set identification: all masks revision letters corresponding to
K2R0ACB mask set;
o Dedicated software identification: APC (Boot sequence, embedded test
software);
o Embedded software identification: UBM this is the Card Manager, a reference
Operating System, embedded in the User ROM of the samples which have
been tested, for the evaluation needs only. The Card Manager is not part of the
evaluation perimeter, cf §1.2.5;
o Manufacturing site identification: ST 4 (Rousset).
Identification elements (2008, K2R0A, masks revision letters, APC, UBM, ST4), in line with
the product configuration list, are marked on the die and visible with a microscope. In
addition, two bytes in OTP allow identifying the product from a logical point of view, as
described in the “Datasheet” (cf. [GUIDES].
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1.2.2. Security services
The product provides mainly the following security services:
- Initialisation of the hardware platform and its attributes;
- Secure handling of the life cycle;
- Logical integrity of the product;
- Test of the product;
- Memory management (firewall);
- Physical tampering protection;
- Security violation administrator;
- Unobservability;
- Symmetric Key Cryptography Support;
- Asymmetric Key Cryptography Support;
- Unpredictable number generation support.
1.2.3. Architecture
The ST23YT66A (ST23YT34A, respectively) microcontrollers are made up of:
A Hardware part:
- An 8/16-bit central processing unit;
- Memories:
ƒ 66 Kbytes (34Kb, respectively) of EEPROM (including 128 bytes of OTP)
with integrity control, for program and data storage,
ƒ 210 Kbytes (110 Kb, respectively) of ROM for user software,
ƒ 5 Kbytes of RAM,
ƒ 30 Kbytes of ROM for dedicated software;
- Security Modules: Memory protection unit (MPU), clock generator, security
monitoring and control, power management, memory integrity control and fault
detection;
- Functional Modules: 3 8-bit timers, I/O management in contact mode (IART ISO
7816-3), USB 2.0 (this interface includes a dedicated 1.2Kbyte RAM on
ST23YT66A product only), True Random Number Generator, EDES co-processor
supporting DES algorithms and the NESCRYPT co-processor with a dedicated 2-
Kbyte RAM supporting public key cryptographic algorithms.
A dedicated software is embedded in ROM which comprises:
- Microcontroller test software (“Auto test”);
- System and Hardware/Software interface management capabilities.
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1.2.4. Life cycle
The product’s life cycle is organised as follow:
Phase 1
Phase 2
Phase 3
Phase 4
Phase 5
Phase 6
Phase 7
Smartcard embedded
software development
Product
constructio
n
IC design with its dedicated
software
Smartcard IC database
construction
IC photomask fabrication
IC testing and prepersonalisation
IC manufacturing
Testing
IC packaging
Testing
Smartcard product finishing process
Testing
Personalisation
Smartcard product end-
usage
Product
usage
End of life process
Legend
Trusted delivery and
verification procedures
Delivery done within
secure environment
Phases
supposed
to
be
secured
STM Rousset
STM Singapore
STM Rousset
DNP Tokyo
DNP Agrate
STM Rousset
STM Rousset
STM, Zaventem
Phase 1
Phase 2
Phase 3
Phase 4
Phase 5
Phase 6
Phase 7
Smartcard embedded
software development
Product
constructio
n
IC design with its dedicated
software
Smartcard IC database
construction
IC photomask fabrication
IC testing and prepersonalisation
IC manufacturing
Testing
IC packaging
Testing
Smartcard product finishing process
Testing
Personalisation
Smartcard product end-
usage
Product
usage
End of life process
Legend
Trusted delivery and
verification procedures
Delivery done within
secure environment
Legend
Trusted delivery and
verification procedures
Delivery done within
secure environment
Phases
supposed
to
be
secured
STM Rousset
STM Singapore
STM Rousset
DNP Tokyo
DNP Agrate
STM Rousset
STM Rousset
STM, Zaventem
Figure 1 – Life cycle of a smart card
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The product is designed, prepared, manufactured and tested by:
STMicroelectronics SAS
Smartcard IC division
ZI de Rousset, BP2
13106 Rousset Cedex
France
A part of the design is realised by:
STMicroelectronics Pte Ltd
5A Serangoon North Avenue 5
554574 Singapore
Singapore
and by:
STMicroelectronics
Excelsiorlaan 44-46,
B-1930 Zaventem,
Belgium.
The photo masks of the product are manufactured by:
DAI NIPPON PRINTING CO., LTD
2-2-1, Fukuoka, kamifukuoka-shi,
Saitama-Ken, 356-8507
Japan
and by:
DAI NIPPON PRINTING EUROPE
Via C. Olivetti, 2/A,
I-20041 Agrate Brianza,
Italy
The product manages itself the logical phases of its life cycle and can be in one of its two
following configurations:
• “Test” configuration: at the end of IC manufacturing, the microcontroller is tested
using the test software stored in ROM (called “Autotest”) within the secure developer
premises. Pre-personalization data can be loaded in the EEPROM. The product
configuration is changed to “User” before delivery to the next user, and the device
cannot be reversed to the “test” configuration.
• “User” configuration: final configuration of the product, including 3 modes:
ƒ “reduced test”, allowing STMicroelectronics to perform some reduced sets of
test;
ƒ “diagnosis”, allowing even more limited operations, restricted to
STMicroelectronics;
ƒ “end user”, final usage mode of the product, whose functionalities are driven
exclusively by the Embedded Software. The developer test functionalities are
unavailable. The end-users of the product can use it only under this mode.
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1.2.5. Evaluated configuration
This certification report presents the evaluation work related to the product and the dedicated
software identified in §1.2.1. Any other embedded application, such as the Card Manager
embedded for evaluation purpose only, is not part of the evaluation perimeter.
Referring to the life-cycle, the evaluated product is the product that comes out the
manufacturing, test and pre-personalization phase (phase 3).
For the evaluation needs, the products SB23YT66A and SB23YT34A (with internal revision
C), including the cryptographic library Neslib v2.0 which were certified with the reference
ANSSI-CC-2010/24, were provided to the ITSEF with a dedicated evaluation software in a
mode known as “open1
”.
1
mode that enables to load and execute a native code in EEPROM and also to disable the configurable security
mechanisms.
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2. Evaluation
2.1. Evaluation referential
The evaluation has been performed in compliance with Common Criteria version 3.1 [CC]
and the Common Evaluation Methodology [CEM].
For assurance components above EAL4 level, the evaluation facility own evaluation methods,
validated by ANSSI, have been used.
In order to meet the specificities of smart cards, the [CC IC] and [CC AP] guides have been
applied.
2.2. Evaluation work
This evaluation is partially based on previous evaluation results of certified products from the
ST23Y family.
The evaluation technical report [ETR], delivered to ANSSI on the 2th
of March 2010,
describes the work performed by the evaluation facility and assesses that all evaluation tasks
are “pass”.
2.3. Cryptographic mechanisms robustness analysis according to ANSSI
technical reference frame
The evaluated product provides the following cryptographic support services:
- support for symmetric key cryptography (EDES) ;
- support for asymmetric key cryptography (NESCRYPT) ;
- support for random numbers generation (TRNG).
These services, however, cannot be analyzed in relation to the ANSSI technical reference
frame [REF-CRY], [REF-CLE] and [REF-AUT] as they do not contribute to the inherent
security of the product; their strength will depend on their use by the application embedded in
the microcircuit.
2.4. Random number generator analysis
The evaluated product provides a hardware random number generator that has been evaluated
according to the [AIS31] methodology by the evaluation facility: the generator reaches the
class “P2 – SOF-high” according to [AIS31].
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3. Certification
3.1. Conclusion
The evaluation was carried out according to the current rules and standards, with the required
competency and impartiality as required for an accredited evaluation facility. All the work
performed allows the release of a certificate in conformance with the decree 2002-535.
This certificate testifies that the secure microcontrollers ST23YT66/34A submitted for
evaluation fulfil the security features specified in its security target [ST] for the evaluation
level EAL5 augmented.
3.2. Restrictions of use
This certificate only applies on the products specified in chapter 1.2 of this certification
report.
This certificate provides a resistance assessment of the ST23YT66/34A products to a set of
attacks which remains generic due to the missing of any specific embedded application.
Therefore, the security of a final product based on the evaluated microcontrollers would only
be assessed through the final product evaluation, which could be performed using the results
of current evaluation listed in Chapter 2.
The user of the certified product shall respect the operational environmental security
objectives specified in the security target [ST] chapter 5.2 and shall respect the
recommendations in the guidance [GUIDES].
3.3. Recognition of the certificate
3.3.1. European recognition (SOG-IS)
This certificate is issued in accordance with the provisions of the SOG-IS agreement [SOG-
IS].
The European recognition agreement made by SOG-IS in 1999 allows recognition from
signatory states of the agreement1
, of ITSEC and Common Criteria certificates. The European
recognition is applicable up to ITSEC E6 and CC EAL7 levels. The certificates that are
recognized in such scope are released with the following marking:
1 The signatory countries of the SOG-IS agreement are: Finland, France, Germany, The Netherlands, Norway,
Spain, Sweden and United Kingdom.
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3.3.2. International common criteria recognition (CCRA)
This certificate is released in accordance with the provisions of the CCRA [CC RA].
The Common Criteria Recognition Arrangement allows the recognition, by signatory
countries1
, of the Common Criteria certificates. The mutual recognition is applicable up to the
assurance components of CC EAL4 level and also to ALC_FLR family. The certificates that
are recognized in the agreement scope are released with the following marking:
1 The signatory countries of the CCRA arrangement are: Australia, Austria, Canada, Czech Republic, Denmark,
Finland, France, Germany, Greece, Hungary, India, Israel, Italy, Japan, the Republic of Korea, Malaysia,
Netherlands, New-Zealand, Norway, Pakistan, Singapore, Spain, Sweden, Turkey, the United Kingdom and the
United States of America.
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Annex 1. Evaluation level of the product
Classe Famille Composants par niveau
d’assurance
Niveau d’assurance retenu
pour le produit
EAL
1
EAL
2
EAL
3
EAL
4
EAL
5
EAL
6
EAL
7
EAL
5+
Intitulé du composant
ADV
Développement
ADV_ARC 1 1 1 1 1 1 1
Security architecture
description
ADV_FSP 1 2 3 4 5 5 6 5
Complete semiformal functional
specification with additional
error information
ADV_IMP 1 1 2 2 1
Implementation
representation of the TSF
ADV_INT 2 3 3 2 Well-structured internals
ADV_SPM 1 1
ADV_TDS 1 2 3 4 5 6 4 Semiformal modular design
AGD
Guides
d’utilisation
AGD_OPE 1 1 1 1 1 1 1 1 Operational user guidance
AGD_PRE 1 1 1 1 1 1 1 1 Preparative procedure
ALC
Support au
cycle de vie
ALC_CMC 1 2 3 4 4 5 5 4
Production support,
acceptance procedures and
automation
ALC_CMS 1 2 3 4 5 5 5 5
Development tools CM
coverage
ADO_DEL 1 1 1 1 1 1 1 Delivery procedures
ALC_DVS 1 1 1 2 2 2
Sufficiency of security
measures
ALC_FLR
ALC_LCD 1 1 1 1 2 1
Developer defined life-cycle
model
ALC_TAT 1 2 3 3 2
Compliance with
implementation standards
ASE
Evaluation de la
cible de sécurité
ASE_CCL 1 1 1 1 1 1 1 1 Conformance claim
ASE_ECD 1 1 1 1 1 1 1 1
Extended component
definition
ASE_INT 1 1 1 1 1 1 1 1 ST introduction
ASE_OBJ 1 2 2 2 2 2 2 2 Security objectives
ASE_REQ 1 2 2 2 2 2 2 2
Derived security
requirements
ASE_SPD 1 1 1 1 1 1 1 Security problem definition
ASE_TSS 1 1 1 1 1 1 1 1 TOE summary specifications
ATE
Tests
ATE_COV 1 2 2 2 3 3 2 Analysis of coverage
ATE_DPT 1 2 3 3 4 3 Testing: modular design
ATE_FUN 1 1 1 1 2 2 1 Functional testing
ATE_IND 1 2 2 2 2 2 3 2 Independant testing, sample
AVA
Estimation des
vulnérabilités
AVA_VAN 1 2 2 3 4 5 5 5
Advanced methodical
vulnerability analysis
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Annex 2. Evaluated product references
[ST] Reference security target for the evaluation:
- SB/SA/ST23YT66/34 Security Target,
Reference : SMD_Sx23YTxx_ST_09_001, v01.00,
STMicroelectronics
For the needs of publication, the following security target has been
provided and validated in the evaluation:
- SB/SA/ST23YT66/34 Security Target - Public Version,
Reference : SMD_Sx23YTxx_ST_09_002, v01.00,
STMicroelectronics
[ETR] Evaluation technical report :
- Evaluation Technical Report - LAFITE Project,
Reference : LAFITE-SB23YT66A_ETR_v1.0 / 1.0,
2 March 2010, Serma Technologies
For the needs of composite evaluation with this microcontroller a
technical report for composition has been validated:
- ETR Lite for Composition – LAFITE project,
Reference: LAFITE_SB23YT66A_ETRLiteComp_v1.0 / 1.0,
Serma Technologies
[CONF] Products configuration list:
- Configuration list,
Reference : SMD_SB23YT66_CFGL_09_001 rev 1.0,
STMicroelectronics
List of the delivered materials:
- documentation report,
Reference : SMD_SB23YT66_34DR_09_001 v1.0,
STMicroelectronics
[GUIDES] The product user guidance documentation is the following:
- ST23YT66 Datasheet,
Reference : DS_23YT66 Rev 7,
STMicroelectronics
- ST23YT34 Datasheet,
Reference : DS_23YT34 Rev 1,
STMicroelectronics
- ST23 Platform - Security Guidance,
Reference : AN_SECU_23 Rev 7,
STMicroelectronics
- ST23 USB LIB user manual,
Reference : UM_23_USBLIB, Rev 2,
STMicroelectronics
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- ST21/23 programming manual,
Reference : PM_21_23/0709 Rev 1,
STMicroelectronics
- ST23 AIS31 Compliant Random Number User Manual,
Référence : UM_23_AIS31 Rev 1,
STMicroelectronics
- ST23 AIS31 Tests reference implementation user manual,
Référence : AN_23_AIS31 Rev1,
STMicroelectronics
[PP0035] Security IC Platform Protection Profile Version 1.0 June 2007. Certified
by BSI (Bundesamt für Sicherheit in der Informationstechnik) under the
reference BSI-PP-0035-2007.
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Annex 3. Certification references
Decree number 2002-535 dated 18th
April 2002 related to the security evaluations and
certifications for information technology products and systems.
[CER/P/01] Procedure CER/P/01 - Certification of the security provided by IT
products and systems, DCSSI.
[CC] Common Criteria for Information Technology Security Evaluation :
Part 1: Introduction and general model, September 2006, version 3.1,
revision 1, ref CCMB-2006-09-001,
Part 2: Security functional components, September 2007, version 3.1,
revision 2, ref CCMB-2007-09-002,
Part 3: Security assurance components, September 2007, version 3.1,
revision 2, ref CCMB-2007-09-003.
[CEM] Common Methodology for Information Technology Security Evaluation :
Evaluation Methodology, September 2007, version 3.1, ref CCMB-2007-
09-004, revision 2.
[CC IC] Common Criteria Supporting Document - Mandatory Technical
Document - The Application of CC to Integrated Circuits, reference
CCDB-2006-04-003 version 2.0, revision 1, April 2006.
[CC AP] Common Criteria Supporting Document - Mandatory Technical
Document - Application of attack potential to smart-cards, reference
CCDB-2009-03-001 version 2.7 revision 1, March 2009.
[REF-CRY] Cryptographic mechanisms - Rules and recommendations about the
choice and parameters sizes of cryptographic mechanisms, version 1.11,
24th
of October 2008, see www.ssi.gouv.fr
[REF-CLE] Cryptographic keys management - Rules and recommendations about
management of keys used in cryptographic mechanisms, version 1.10,
24th
of October 2008, see www.ssi.gouv.fr
[REF-AUT] Authentication - Rules and recommendations about authentication
mechanisms with standard level robustness, v0.13 12th
of April 2007, No.
729/SGDN/DCSSI/SDS
[AIS31] Functionality classes and evaluation methodology for physical random
number generator, AIS31 version 1, 25/09/2001,
Bundesamt für Sicherheit in der Informationstechnik (BSI)