TrustCB B.V.
Registered address:
Van den Berghlaan 48, 2132 AT
Hoofddorp, The Netherlands
nscib@trustcb.com
https://trustcb.com/common-criteria/nscib/
https://nscib.nl
TrustCB B.V. is a registered company at the
Netherlands Chamber of Commerce (KVK),
under number 858360275.
Version
2023-06
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Certification Report
ST33K1M5A and ST33K1M5M B02
Sponsor and developer: STMicroelectronics
190 avenue Celestin Coq, ZI de Rousset-Peynier
13106 Rousset
France
Evaluation facility: SGS Brightsight B.V.
Brassersplein 2
2612 CT Delft
The Netherlands
Report number: NSCIB-CC-2300112-01-CR
Report version: 1
Project number: NSCIB-2300112-01
Author(s): Jordi Mujal
Date: 04 October 2023
Number of pages: 12
Number of appendices: 0
Reproduction of this report is authorised only if the report is reproduced in its entirety.
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CONTENTS
Foreword 3
Recognition of the Certificate 4
International recognition 4
European recognition 4
1 Executive Summary 5
2 Certification Results 6
2.1 Identification of Target of Evaluation 6
2.2 Security Policy 6
2.3 Assumptions and Clarification of Scope 6
2.3.1 Assumptions 6
2.3.2 Clarification of scope 6
2.4 Architectural Information 7
2.5 Documentation 7
2.6 IT Product Testing 8
2.6.1 Testing approach and depth 8
2.6.2 Independent penetration testing 8
2.6.3 Test configuration 8
2.6.4 Test results 9
2.7 Reused Evaluation Results 9
2.8 Evaluated Configuration 9
2.9 Evaluation Results 9
2.10 Comments/Recommendations 9
3 Security Target 11
4 Definitions 11
5 Bibliography 12
Page: 3/12 of report number: NSCIB-CC-2300112-01-CR, dated 04 October 2023
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Foreword
The Netherlands Scheme for Certification in the Area of IT Security (NSCIB) provides a third-party
evaluation and certification service for determining the trustworthiness of Information Technology (IT)
security products. Under this NSCIB, TrustCB B.V. has the task of issuing certificates for IT security
products, as well as for protection profiles and sites.
Part of the procedure is the technical examination (evaluation) of the product, protection profile or site
according to the Common Criteria assessment guidelines published by the NSCIB. Evaluations are
performed by an IT Security Evaluation Facility (ITSEF) under the oversight of the NSCIB Certification
Body, which is operated by TrustCB B.V. in cooperation with the Ministry of the Interior and Kingdom
Relations.
An ITSEF in the Netherlands is a commercial facility that has been licensed by TrustCB B.V. to
perform Common Criteria evaluations; a significant requirement for such a licence is accreditation to
the requirements of ISO Standard 17025 “General requirements for the accreditation of calibration and
testing laboratories”.
By awarding a Common Criteria certificate, TrustCB B.V. asserts that the product or site complies with
the security requirements specified in the associated (site) security target, or that the protection profile
(PP) complies with the requirements for PP evaluation specified in the Common Criteria for
Information Security Evaluation. A (site) security target is a requirements specification document that
defines the scope of the evaluation activities.
The consumer should review the (site) security target or protection profile, in addition to this
certification report, to gain an understanding of any assumptions made during the evaluation, the IT
product's intended environment, its security requirements, and the level of confidence (i.e., the
evaluation assurance level) that the product or site satisfies the security requirements stated in the
(site) security target.
Reproduction of this report is authorised only if the report is reproduced in its entirety.
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Recognition of the Certificate
Presence of the Common Criteria Recognition Arrangement (CCRA) and the SOG-IS logos on the
certificate indicates that this certificate is issued in accordance with the provisions of the CCRA and
the SOG-IS Mutual Recognition Agreement (SOG-IS MRA) and will be recognised by the participating
nations.
International recognition
The CCRA was signed by the Netherlands in May 2000 and provides mutual recognition of certificates
based on the Common Criteria (CC). Since September 2014 the CCRA has been updated to provide
mutual recognition of certificates based on cPPs (exact use) or STs with evaluation assurance
components up to and including EAL2+ALC_FLR.
For details of the current list of signatory nations and approved certification schemes, see
http://www.commoncriteriaportal.org.
European recognition
The SOG-IS MRA Version 3, effective since April 2010, provides mutual recognition in Europe of
Common Criteria and ITSEC certificates at a basic evaluation level for all products. A higher
recognition level for evaluation levels beyond EAL4 (respectively E3-basic) is provided for products
related to specific technical domains. This agreement was signed initially by Finland, France,
Germany, The Netherlands, Norway, Spain, Sweden and the United Kingdom. Italy joined the SOG-IS
MRA in December 2010.
For details of the current list of signatory nations, approved certification schemes and the list of
technical domains for which the higher recognition applies, see https://www.sogis.eu.
Page: 5/12 of report number: NSCIB-CC-2300112-01-CR, dated 04 October 2023
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1 Executive Summary
This Certification Report states the outcome of the Common Criteria security evaluation of the
ST33K1M5A and ST33K1M5M B02. The developer of the ST33K1M5A and ST33K1M5M B02 is
STMicroelectronics located in Rousset, France and they also act as the sponsor of the evaluation and
certification. A Certification Report is intended to assist prospective consumers when judging the
suitability of the IT security properties of the product for their particular requirements.
The TOE is a serial access microcontroller designed for secure mobile applications and compliant with
[PP_0084]. It incorporates the most recent generation of Arm® processors for embedded secure
systems.
The TOE was previously evaluated by SGS Brightsight B.V. located in Delft, The Netherlands and was
certified under the accreditation of TÜV Rheinland Nederland on 17 August 2022 (CC-22-0428014/2).
The TOE went later through a maintenance process with an update of the guidance documentation
with minor changes [MR]. The current evaluation of the TOE has also been conducted by SGS
Brightsight B.V. and was completed on 04 October 2023 with the approval of the ETR. The
certification procedure has been conducted in accordance with the provisions of the Netherlands
Scheme for Certification in the Area of IT Security [NSCIB].
The current TOE has no changes compared to the maintained TOE [MR].
The certification took into account that the security evaluation reused the evaluation results of
previously performed evaluations. A full, up-to-date vulnerability analysis has been made, as well as
renewed testing.
The scope of the evaluation is defined by the security target [ST], which identifies assumptions made
during the evaluation, the intended environment for the ST33K1M5A and ST33K1M5M B02, the
security requirements, and the level of confidence (evaluation assurance level) at which the product is
intended to satisfy the security requirements. Consumers of the ST33K1M5A and ST33K1M5M B02
are advised to verify that their own environment is consistent with the security target, and to give due
consideration to the comments, observations and recommendations in this certification report.
The results documented in the evaluation technical report [ETR] 1 for this product provide sufficient
evidence that the TOE meets the EAL6 augmented (EAL6+) assurance requirements for the evaluated
security functionality. This assurance level is augmented with ALC_FLR.1 (Basic flaw remediation).
The evaluation was conducted using the Common Methodology for Information Technology Security
Evaluation, Version 3.1 Revision 5 [CEM] for conformance to the Common Criteria for Information
Technology Security Evaluation, Version 3.1 Revision 5 [CC] (Parts I, II and III).
TrustCB B.V., as the NSCIB Certification Body, declares that the evaluation meets all the conditions
for international recognition of Common Criteria Certificates and that the product will be listed on the
NSCIB Certified Products list. Note that the certification results apply only to the specific version of the
product as evaluated.
1 The Evaluation Technical Report contains information proprietary to the developer and/or the
evaluator, and is not available for public review.
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2 Certification Results
2.1 Identification of Target of Evaluation
The Target of Evaluation (TOE) for this evaluation is the ST33K1M5A and ST33K1M5M B02 from
STMicroelectronics located in Rousset, France.
The TOE is comprised of the following main components:
Delivery
item type
Identifier Version
Hardware
ST33K1M5A
IC Maskset name: K4A0
IC version: A or B
Master identification number:0x0260
ST33K1M5M
IC Maskset name: K4A0
IC version: A or B
Master identification number:0x024B
Software Firmware
3.1.3 (on IC version A)
3.1.4 (on IC version B)
To ensure secure usage a set of guidance documents is provided, together with the ST33K1M5A and
ST33K1M5M B02. For details, see section 2.5 “Documentation” of this report.
For a detailed and precise description of the TOE lifecycle, see the [ST-lite], Chapter 1.7.
2.2 Security Policy
The TOE offers powerful features for high level security:
• Two instances of the Arm® Cortex-M35P CPU connected in lockstep mode
• Die integrity
• Monitoring of environmental parameters
• Highly efficient protection against faults
• AIS20/31 class PTG.2 compliant True Random Number Generator
• Memory Protection Unit and Library Protection Unit
• Hardware security enhanced AES accelerator
• Hardware security enhanced 3-key triple DES accelerator
• Secure Flash Loader
• NESCRYPT LLP coprocessor for public key cryptography algorithm (the TOE offers this
functionality, there is no TOE security requirement that relies on this coprocessor however, in
order to support a composite evaluation, the Vendor asked the Lab to carry out additional testing
that is included in the [ETRfc])
2.3 Assumptions and Clarification of Scope
2.3.1 Assumptions
The assumptions defined in the Security Target are not covered by the TOE itself. These aspects lead
to specific Security Objectives to be fulfilled by the TOE-Environment. For detailed information on the
security objectives that must be fulfilled by the TOE environment, see section 4.2 of the [ST-lite].
2.3.2 Clarification of scope
The evaluation did not reveal any threats to the TOE that are not countered by the evaluated security
functions of the product.
Page: 7/12 of report number: NSCIB-CC-2300112-01-CR, dated 04 October 2023
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Please note that although the TOE contains HW accelerators for SM4, MIFARE, CRC and public key
cryptography (NESCRYPT LLP), the functionality and security of these features have not explicitly
been addressed in this evaluation. Therefore, if these features are required by the composite product
the developer/evaluator should do their own security analysis and/or testing. In case of NESCRYPT
LLP, in order to support this analysis, the Vendor asked the Lab to carry out additional testing that is
included in the [ETRfC].
2.4 Architectural Information
The TOE architecture is depicted below.
2.5 Documentation
The following documentation is provided with the product by the developer to the customer:
Identifier Version Date
Automotive, High-speed secure MCU with 32-bit Arm® Cortex®-
M35P CPU with SWP, ISO, SPI and I2C interfaces, and high-density
flash memory – ST33K1M5A Datasheet, DS_ST33K1M5A
3 May 2023
High-speed secure MCU with 32-bit Arm® Cortex®-M35P CPU with
SWP, ISO, SPI and I2C interfaces, and high density flash memory –
ST33K1M5M Datasheet, DS_ST33K1M5M
3 May 2023
Security Guidance of the ST33K Secure MCU platform - Application
note, AN_SECU_ST33K
1.0
September
2021
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ST33K platform firmware V3 – User manual, UM_ST33K_FW 7 March 2023
Arm® Cortex®-M35P Processor Technical Reference Manual,
100883_0101_00_en
r1p1 December 2018
Arm® Cortex®-M35P Armv8-M Architecture Supplement, PJDOC-
466751330-1229
1.0 November 2018
Random number generation V1.4 – User manual, UM_ST_TRNG14 7 April 2023
ST33K Platform- TRNG Reference implementation: Compliance tests,
AN_ST33K_TRNG
3 May 2023
2.6 IT Product Testing
Testing (depth, coverage, functional tests, independent testing): The evaluators examined the
developer’s testing activities documentation and verified that the developer has met their testing
responsibilities.
2.6.1 Testing approach and depth
The developer performed extensive testing on functional specification, subsystem and module level.
All parameter choices were addressed at least once. All boundary cases identified were tested
explicitly, and additionally the near-boundary conditions were covered probabilistically. The testing
was largely automated using industry standard and proprietary test suites. Test scripts were used
extensively to verify that the functions return the expected values.
For the testing performed by the evaluators, the developer provided samples and a test environment.
The evaluators reproduced a selection of the developer tests, as well as a small number of test cases
designed by the evaluator. During this re-evaluation, due to the limited and localized changes on the
HW, a very specific subset of the independent testing was repeated.
2.6.2 Independent penetration testing
The independent vulnerability analysis performed was conducted along the following steps:
• When evaluating the evidence in the classes ASE, ADV and AGD the evaluator considered
whether potential vulnerabilities could already be identified due to the TOE type and/or
specified behaviour in such an early stage of the evaluation.
• For ADV_IMP a thorough implementation representation review was performed on the TOE.
During this attack-oriented analysis the protection of the TOE was analysed using the
knowledge gained from all evaluation classes. This resulted in the identification of
(additional) potential vulnerabilities. This analysis used the attack methods in [JIL-AM] and
[JIL-AAPS].
• All potential vulnerabilities were analysed using the knowledge gained from all evaluation
classes and information from the public domain. A judgment was made on how to assure
that these potential vulnerabilities are not exploitable. The potential vulnerabilities were
addressed by penetration testing, a guidance update or in other ways that are deemed
appropriate.
During this re-evaluation the total test effort expended by the evaluators was 9 weeks. During that test
campaign, 45% of the total time was spent on Perturbation attacks, 45% on side-channel testing, and
10% on logical tests.
2.6.3 Test configuration
The configuration of the sample used for independent evaluator testing and penetration testing was
the same as described in the [ST].
Page: 9/12 of report number: NSCIB-CC-2300112-01-CR, dated 04 October 2023
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2.6.4 Test results
The testing activities, including configurations, procedures, test cases, expected results and observed
results are summarised in the [ETR], with references to the documents containing the full details.
The developer’s tests and the independent functional tests produced the expected results, giving
assurance that the TOE behaves as specified in its [ST] and functional specification.
No exploitable vulnerabilities were found with the independent penetration tests.
The algorithmic security level of cryptographic functionality has not been rated in this certification
process, but the current consensus on the algorithmic security level in the open domain, i.e., from the
current best cryptanalytic attacks published, has been taken into account.
The algorithmic security level exceeds 100 bits for all evaluated cryptographic functionality as required
for high attack potential (AVA_VAN.5).
The strength of the implementation of the cryptographic functionality has been assessed in the
evaluation, as part of the AVA_VAN activities
For composite evaluations, please consult the [ETRfC] for details.
2.7 Reused Evaluation Results
Documentary evaluation results of the earlier version of the TOE have been re-used. The evaluator
has renewed the vulnerability analysis and performed a penetration testing campaign.
There has been extensive reuse of the ALC aspects involved in the development and production of
the TOE, by use of multiple Site Technical Audit Reports.
No sites have been visited as part of this evaluation.
2.8 Evaluated Configuration
The TOE is defined uniquely by its name and version number ST33K1M5A and ST33K1M5M B02
together with the IC and firmware version identifiers.
2.9 Evaluation Results
The evaluation lab documented their evaluation results in the [ETR], which references an ASE
Intermediate Report and other evaluator documents. To support composite evaluations according to
[COMP] a derived document [ETRfC] was provided and approved. This document provides details of
the TOE evaluation that must be considered when this TOE is used as platform in a composite
evaluation.
The verdict of each claimed assurance requirement is “Pass”.
Based on the above evaluation results the evaluation lab concluded the ST33K1M5A and
ST33K1M5M B02, to be CC Part 2 extended, CC Part 3 conformant, and to meet the requirements
of EAL 6 augmented with ALC_FLR.1. This implies that the product satisfies the security
requirements specified in Security Target [ST].
The Security Target claims ’strict’ conformance to the Protection Profile [PP_0084].
2.10 Comments/Recommendations
The user guidance as outlined in section 2.5 “Documentation” contains necessary information about
the usage of the TOE. Certain aspects of the TOE’s security functionality, in particular the
countermeasures against attacks, depend on accurate conformance to the user guidance of both the
software and the hardware part of the TOE. There are no particular obligations or recommendations
for the user apart from following the user guidance. Please note that the documents contain relevant
details concerning the resistance against certain attacks.
In addition, all aspects of assumptions, threats and policies as outlined in the Security Target not
covered by the TOE itself must be fulfilled by the operational environment of the TOE.
The customer or user of the product shall consider the results of the certification within his system risk
management process. For the evolution of attack methods and techniques to be covered, the
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customer should define the period of time until a re-assessment for the TOE is required and thus
requested from the sponsor of the certificate.
The strength of the cryptographic algorithms and protocols was not rated in the course of this
evaluation. This specifically applies to the following proprietary or non-standard algorithms, protocols
and implementations: none, which are out of scope as there are no security claims relating to these.
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3 Security Target
The ST33K1M5A and ST33K1M5M B02 SECURITY TARGET, Rev. B02.1, May 2023 [ST] is included
here by reference.
Please note that, to satisfy the need for publication, a public version [ST-lite] has been created and
verified according to [ST-SAN].
4 Definitions
This list of acronyms and definitions contains elements that are not already defined by the CC or CEM:
AES Advanced Encryption Standard
CBC Cipher Block Chaining (a block cipher mode of operation)
CBC-MAC Cipher Block Chaining Message Authentication Code
DES Data Encryption Standard
DFA Differential Fault Analysis
EMA Electromagnetic Analysis
IC Integrated Circuit
IT Information Technology
ITSEF IT Security Evaluation Facility
JIL Joint Interpretation Library
NESCRYPT LLP Next Step Cryptography Accelerator Lite Low Power
NSCIB Netherlands Scheme for Certification in the area of IT Security
PP Protection Profile
RNG Random Number Generator
SHA Secure Hash Algorithm
SPA/DPA Simple/Differential Power Analysis
TOE Target of Evaluation
TRNG True Random Number Generator
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5 Bibliography
This section lists all referenced documentation used as source material in the compilation of this
report.
[CC] Common Criteria for Information Technology Security Evaluation, Parts I, II and
III, Version 3.1 Revision 5, April 2017
[CEM] Common Methodology for Information Technology Security Evaluation,
Version 3.1 Revision 5, April 2017
[COMP] Joint Interpretation Library, Composite product evaluation for Smart Cards and
similar devices, Version 1.5.1, May 2018
[ETR] Evaluator Assessment of Changes Report (EAR) ST33K1M5A and
ST33K1M5M B02– Partial ETR, 23-RPT-974, version 2.0, 03 October 2023.
[ETRfC] Evaluation Technical Report for Composition “ST33K1M5A and ST33K1M5M
B02”– EAL6+, 23-RPT-975, version 3.0, 30 August 2023
[JIL-AAPS] JIL Application of Attack Potential to Smartcards, Version 3.2, November 2022
[JIL-AM] Attack Methods for Smartcards and Similar Devices, Version 2.4, January 2020
(sensitive with controlled distribution)
[NSCIB] Netherlands Scheme for Certification in the Area of IT Security, Version 2.6,
02 August 2022
[MR] Assurance Continuity Maintenance Report ST33K1M5A and ST33K1M5M B02,
NSCIB-CC-0428014-2MA1, version 1, 28 July 2023.
[PP_0084] Security IC Platform Protection Profile with Augmentation Packages, registered
under the reference BSI-CC-PP-0084-2014, Version 1.0, 13 January 2014
[ST] ST33K1M5A and ST33K1M5M B02 SECURITY TARGET, Rev. B02.1, May
2023
[ST-lite] ST33K1M5A and ST33K1M5M B02 SECURITY TARGET FOR
COMPOSITION, Rev. B02.1, May 2023
[ST-SAN] ST sanitising for publication, CC Supporting Document CCDB-2006-04-004,
April 2006
(This is the end of this report.)