oSIST prEN 304 624 V1.0.0:2026

• Abstract:

  DEN/CYBER-EUS-0015

• Status: Not Published
• Public Enquiry End Date: 28-Oct-2026
• ICS: 35.030 - IT Security
• Technical Committee: SPN - Services and Protocols for Networks
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 10-Aug-2026
• Due Date: 28-Dec-2026
• Ref Project: ETSI EN 304 624 V1.0.0 (2026-08) - Cyber Security (CYBER); CRA; Cybersecurity requirements for Public key infrastructure and digital certificate issuance software

Overview

oSIST prEN 304 624 V1.0.0:2026 is a harmonised European standard prepared by the European Committee for Standardization (SIST) and ETSI Technical Committee Cyber Security (CYBER). This document defines cybersecurity requirements for public key infrastructure (PKI) and digital certificate issuance software in alignment with the EU Cyber Resilience Act (CRA), aiming to enhance trust and security for digital products and services across Europe. The standard provides a detailed risk-based approach to ensure that such products are robust against foreseeable threats throughout their lifecycle, helping manufacturers, service providers, and users maintain compliance and improve cyber resilience.

Key Topics

This standard addresses a comprehensive set of cybersecurity aspects relevant to PKI and digital certificate management:

• Scope and Definitions: Clear definitions of terms, abbreviations, and the product context, including use cases for private and public PKI in both critical and non-critical sectors.
• Technical Requirements:
  • Secure architectures and configurations (“secure by default”)
  • Elimination of known exploitable vulnerabilities
  • Robust authentication and access control mechanisms
  • Confidentiality and secure management of keys, data, and communications
  • Data integrity monitoring, certificate signing and revocation processes
  • Data minimization and secret management practices
  • Mechanisms for secure software updates and logging
  • Availability protection (e.g., certificate suspension and status checking services)
  • Attack surface minimization and exploitation mitigation
  • Requirements for cryptography, including agility and support for interoperability
• Assessment and Compliance Criteria: Procedures and benchmarks to demonstrate that technical requirements are met, including mapping against CRA requirements.
• Risk Assessment Methodology: Guidance for evaluating security risks based on deployment context, user expertise, network/physical security, and potential impact factors.

Applications

The practical value of this standard lies in supporting:

• Product Manufacturers and Developers: Serving as a framework to design, implement, and maintain PKI and certificate issuance software with strong cybersecurity controls.
• Conformance Assessment: Providing clear assessment criteria to demonstrate compliance with both European Union cybersecurity regulations and industry best practices.
• Critical Infrastructure Sectors: Assisting operators in energy, finance, telecommunications, healthcare, and public administration to select and operate trusted PKI solutions.
• Certification Authorities (CAs) and Trust Service Providers: Establishing structured guidelines for issuing, revoking, and managing digital certificates securely.
• Procurement and Security Auditing: Acting as a reference for evaluating digital certificate products and managing supply chain security.
• Alignment with CRA: Ensuring products covered by the Cyber Resilience Act meet horizontal regulatory requirements in the EU, streamlining market access.

Related Standards

Several key standards and legislative acts are relevant to oSIST prEN 304 624 V1.0.0:2026:

• EU Regulation (EU) 2024/2847 – Cyber Resilience Act (CRA): Lays out overarching cybersecurity requirements for products with digital elements across the EU.
• Commission Implementing Regulation (EU) 2025/2392: Specifies technical descriptions and categories for products covered by the CRA.
• ETSI SR 000 314: Provides guidelines on intellectual property rights (IPRs) for ETSI standards.
• ETSI Drafting Rules: Governs the use of modal verbs and requirements expression in standards documentation.
• Other ETSI Cyber Security Standards: Including standards for cryptographic mechanisms, risk management, and incident reporting.

By following the guidance in this document, organizations can ensure that their PKI and digital certificate issuance software are resilient, compliant, and ready for the demanding requirements of the modern digital ecosystem. This standard is essential for any stakeholder involved in the development, deployment, or management of trusted digital identities and secure communications infrastructure.

Draft ETSI EN 304 624 V1.0.0 (2026-08)
HARMONISED EUROPEAN STANDARD
Cyber security (CYBER);
CRA;
Cybersecurity requirements for public key infrastructure and
digital certificate issuance software

2 Draft ETSI EN 304 624 V1.0.0 (2026-08)

Reference
DEN/CYBER-EUS-0015
Keywords
certificate, CRA, cybersecurity, public key
infrastructure
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE

Tel.: [phone]  Fax: [phone]

Siret N° 348 623 562 00017 - APE 7112B
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° w061004871

Important notice
The present document can be downloaded from the
ETSI Search & Browse Standards application.
The present document may be made available in electronic versions and/or in print. The content of any electronic and/or
print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any
existing or perceived difference in contents between such versions and/or in print, the prevailing version of an ETSI
deliverable is the one made publicly available in PDF format on ETSI deliver repository.
Users should be aware that the present document may be revised or have its status changed,
this information is available in the Milestones listing.
If you find errors in the present document, please send your comments to
the relevant service listed under Committee Support Staff.
If you find a security vulnerability in the present document, please report it through our
Coordinated Vulnerability Disclosure (CVD) program.
Notice of disclaimer & limitation of liability
The information provided in the present deliverable is directed solely to professionals who have the appropriate degree of
experience to understand and interpret its content in accordance with generally accepted engineering or
other professional standard and applicable regulations.
No recommendation as to products and services or vendors is made or should be implied.
In no event shall ETSI be held liable for loss of profits or any other incidental or consequential damages.

Any software contained in this deliverable is provided "AS IS" with no warranties, express or implied, including but not
limited to, the warranties of merchantability, fitness for a particular purpose and non-infringement of intellectual property
rights and ETSI shall not be held liable in any event for any damages whatsoever (including, without limitation, damages
for loss of profits, business interruption, loss of information, or any other pecuniary loss) arising out of or related to the use
of or inability to use the software.
Copyright Notification
No part of this document may be reproduced in any form, by any means and in any media, without the prior written
authorization of ETSI and except as expressly permitted below.
By way of exception and when the document is a normative deliverable (European Standard (EN),
Technical Specification (TS), Group Specification (GS) or ETSI Standard (ES)), ETSI authorizes to reproduce
and incorporate into products, services and technical documentation only those extracts (e.g. templates) that are strictly
necessary for the technical implementation of the normative deliverable, to ensure compliance with the latter.
Nothing in this notice shall be construed as limiting any mandatory exceptions to copyright provided by applicable law.

© ETSI 2026.
All rights reserved.
ETSI
3 Draft ETSI EN 304 624 V1.0.0 (2026-08)
Contents
Introduction . 8
1 Scope . 9
2 References . 9
2.1 Normative references . 9
2.2 Informative references . 9
3 Definition of terms, symbols and abbreviations . 11
3.1 Terms . 11
3.2 Symbols . 12
3.3 Abbreviations . 12
4 Product context . 13
4.0 Introduction . 13
4.1 Product Functions . 14
4.2 Product Architecture. 15
4.3 Operational Environment . 17
4.3.1 General description . 17
4.3.2 Physical/Hardware environment . 17
4.3.3 Logical/Software environment. 17
4.3.4 Connectivity aspects . 17
4.4 Distribution of Security Functions . 18
4.5 Users . 18
4.6 Use cases . 18
4.6.1 Private PKI for non critical sectors (UC1) . 19
4.6.2 Private PKI for critical entities (UC2) . 19
4.6.3 Public PKI for critical entities (UC3) . 19
4.6.4 Public basic PKI for critical entities (UC4) . 20
4.6.5 Multi-authority PKI for critical entities (UC5) . 20
5 Technical requirements for the products . 20
5.1 Introduction - Applicability of the requirements . 20
5.2 No known exploitable vulnerabilities . 21
5.3 Secure by default configuration . 21
5.3.1 SDBC- Access control . 21
5.3.2 SBDC- Monitoring . 21
5.3.3 SBDC- Cryptography . 21
5.3.4 SBDC- Certificates . 22
5.4 Secure updates . 22
5.5 Authentication and access control . 22
5.6 Confidentiality . 23
5.6.1 CON - General . 23
5.6.2 CON - Secure storage and communications . 25
5.6.3 CON - Key management . 25
5.7 Integrity . 25
5.7.1 INT - Monitoring . 25
5.7.2 INT - Certificate signing . 27
5.7.3 INT- CRL signing . 27
5.8 Data minimisation . 27
5.8.1 DM - General . 28
5.8.2 DM - Secret management . 28
5.9 Availability protection . 28
5.9.1 AP - Certificate suspension and revocation . 28
5.9.2 AP - Certificate status services . 29
5.9.3 AP - Key management . 30
5.10 Impact minimisation . 30
5.11 Minimisation of attack surfaces . 30
5.12 Exploitation mitigation mechanisms . 31
5.12.1 EMM - Certificate issuance . 31
ETSI
4 Draft ETSI EN 304 624 V1.0.0 (2026-08)
5.12.2 EMM - Certificate status . 33
5.12.3 EMM - Certificate re-key . 34
5.12.4 EMM - Certificate modification . 34
5.13 Logging and monitoring . 34
5.14 Data removal and transparency . 35
5.14.1 DRT - Secret management . 36
6 Assessment criteria for compliance with technical requirements . 36
6.1 Introduction to the assessment and compliance criteria . 36
6.2 No known exploitable vulnerabilities . 38
6.3 Secure by default configuration . 39
6.3.1 SBDC - Access control . 39
6.3.2 SBDC - Monitoring . 40
6.3.3 SBDC - Cryptography . 41
6.3.4 SBDC - Certificates . 42
6.4 Secure updates . 43
6.5 Authentication and access control . 45
6.5.1 AC - General . 45
6.6 Confidentiality . 46
6.6.1 CON - General . 47
6.6.2 CON - Secure storage and communications . 50
6.6.3 CON - Key management . 51
6.7 Integrity . 53
6.7.1 INT - Monitoring . 53
6.7.2 INT - Certificate signing . 56
6.7.3 INT- CRL signing . 57
6.8 Data minimisation . 58
6.8.1 General . 58
6.8.2 DM - Secret management . 61
6.9 Availability protection . 62
6.9.1 AP - Certificate suspension and revocation . 62
6.9.2 AP - Certificate status services . 65
6.9.3 AP - Key management . 67
6.10 Impact minimisation . 68
6.11 Minimisation of attack surfaces . 69
6.12 Exploitation mitigation mechanisms . 70
6.12.1 EMM - Certificate issuance . 70
6.12.2 EMM - Certificate status . 75
6.12.3 EMM - Certificate re-key . 78
6.12.4 EMM - Certificate modification . 78
6.13 Logging and monitoring . 79
6.14 Data removal and transparency . 83
Annex A (informative): Relationship between the present document and the requirements of
EU Regulation (EU) 2024/2847 – the Cyber Resilience Act . 86
Annex B (informative): Security analysis . 89
B.1 Risk calculation . 89
B.2 Risk Assessment . 90
B.2.1 Likelihood risk factors . 90
B.2.1.1 Deployment . 90
B.2.1.2 Network and Physical security . 91
B.2.1.3 User expertise . 91
B.2.1.4 Interface exposure . 91
B.2.2 Impact risk factors . 91
B.3 Evaluate Risks . 91
B.4 Requirements applicability - threats mapping rational . 100
Annexes C to J: Void . 110
Annex K (normative): Generic cryptographic requirements and assessment . 111
K.1 Cryptography . 111
ETSI
5 Draft ETSI EN 304 624 V1.0.0 (2026-08)
K.1.1 Requirement . 111
K.1.2 Assessment of product cryptographic configuration . 112
K.1.2.0 General . 112
K.1.2.1 Assessment of ACM-listed cryptographic mechanisms. 112
K.1.2.1.1 Assessment objective . 112
K.1.2.1.2 Assessment preparation . 112
K.1.2.1.3 Assessment activities . 112
K.1.2.1.4 Assessment evidence . 112
K.1.2.1.5 Assessment verdict . 113
K.1.2.2 Assessment of ACM-extended cryptographic mechanisms . 113
K.1.2.2.1 Assessment objective . 113
K.1.2.2.2 Assessment preparation . 113
K.1.2.2.3 Assessment activities . 113
K.1.2.2.4 Assessment evidence . 114
K.1.2.2.5 Assessment verdict . 114
K.1.2.3 Assessment of interoperability-based cryptographic mechanisms . 114
K.1.2.3.1 Assessment objective . 114
K.1.2.3.2 Assessment preparation . 114
K.1.2.3.3 Assessment activities . 114
K.1.2.3.4 Assessment evidence . 115
K.1.2.3.5 Assessment verdict . 115
K.2 Crypto agility . 115
K.2.1 Requirement . 115
K.2.2 Assessment of crypto-agility . 116
K.2.2.1 Assessment objective . 116
K.2.2.2 Assessment preparation . 116
K.2.2.3 Assessment activities . 117
K.2.2.4 Assessment evidence . 117
K.2.2.5 Assessment verdict . 117
K.3 ACM-extended cryptographic mechanisms . 117
K.3.1 Requirement . 117
K.3.2 List of ACM-extended cryptographic mechanisms . 118
K.3.3 Assessment . 118
K.4 Interoperability-based cryptographic mechanisms . 118
K.4.1 Requirement . 118
K.4.2 List of interoperability-based cryptographic mechanisms . 118
K.4.3 Assessment . 118
Annexes I to T: Void . 119
Annex U (informative): Use case description . 120
U.1 UC1 - Product for use in Private PKI for non critical sectors . 120
U.1.1 UC1 - General description . 120
U.1.2 UC1 - Product Functions and assets . 122
U.1.2.1 UC1 - List of functions . 122
U.1.2.2 UC1 - Assets . 123
U.1.3 UC1 - Operational Environment . 123
U.1.4 UC1 - Distribution of Security Functions. 123
U.1.5 UC1 - Users . 124
U.2 UC2 - Product for use in Private PKI for critical entities . 124
U.2.1 UC2 - General description . 124
U.2.2 UC2 - List of functions . 126
U.2.2.1 UC2 - Assets . 127
U.2.3 UC2 - Operational Environment . 127
U.2.4 UC2 - Distribution of Security Functions. 128
U.2.5 UC2 - Users . 128
U.3 UC3 - Public PKI for critical entities . 128
U.3.1 General description. 128
ETSI
6 Draft ETSI EN 304 624 V1.0.0 (2026-08)
U.3.2 UC3 - List of functions . 129
U.3.2.1 UC3 - Assets . 130
U.3.3 UC3 - Operational Environment . 130
U.3.4 UC3 - Distribution of Security Functions. 131
U.3.5 UC3 - Users . 131
U.4 UC4 - Product for use in Critical Public basic PKI . 131
U.4.1 UC4 - General description . 131
U.4.2 UC4 - List of functions . 133
U.4.2.1 UC4 - Assets . 133
U.4.3 UC4 - Operational Environment . 134
U.4.4 UC4 - Distribution of Security Functions. 134
U.4.5 UC4 - Users . 134
U.5 UC5 - Product for use in Critical Multi-Authority PKI . 134
U.5.1 General description. 134
U.5.2 UC5 - List of functions . 136
U.5.2.1 UC5 - Assets . 137
U.5.3 UC5 - Operational Environment . 138
U.5.4 UC5 - Distribution of Security Functions. 138
U.5.5 UC5 - Users . 138
Annex V (informative): Change history . 139
History . 141

ETSI
7 Draft ETSI EN 304 624 V1.0.0 (2026-08)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables (European Standard (EN), Technical Specification (TS),
Group Specification (GS) or ETSI Standard (ES)) may have been declared to ETSI. The declarations pertaining to these
essential IPRs, if any, are publicly available for ETSI members and non-members, and can be found in
ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the
ETSI IPR online database.
Pursuant to the ETSI Directives including the ETSI IPR Policy, no investigation regarding the essentiality of IPRs,
including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not
referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become,
essential to the present document.
Trademarks
The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners.
ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does
not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks.
DECT™, PLUGTESTS™, UMTS™ and the ETSI logo are trademarks of ETSI registered for the benefit of its
Members. 3GPP™, LTE™ and 5G™ logo are trademarks of ETSI registered for the benefit of its Members and of the
3GPP Organizational Partners. oneM2M™ logo is a trademark of ETSI registered for the benefit of its Members and of ®
the oneM2M Partners. GSM and the GSM logo are trademarks registered and owned by the GSM Association.
Foreword
This draft Harmonised European Standard (EN) has been produced by ETSI Technical Committee Cyber Security
(CYBER), and is now submitted for the combined Public Enquiry and Vote phase of the ETSI Standardisation Request
deliverable Approval Procedure (SRdAP).
The present document has been prepared under the Commission's Standardisation request M/606 - C(2025)618 [i.3] to
provide one voluntary means of conforming to the requirements of EU Regulation No 2024/2847 of the European
Parliament and of the Council of 23 October 2024 on horizontal cybersecurity requirements for products with digital
elements and amending Regulations (EU) No 168/2013 and (EU) No 2019/1020 and Directive (EU) 2020/1828 (Cyber
Resilience Act) (CRA) [i.1].
Once the present document is cited in the Official Journal of the European Union under that Regulation, compliance
with the normative clauses of the present document given in Table A.1 confers, within the limits of the scope of the
present document, a presumption of conformity with the corresponding requirements of that Regulation and associated
EFTA regulations.
Proposed national transposition dates
Date of latest announcement of this EN (doa): 3 months after ETSI publication
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 6 months after doa
Date of withdrawal of any conflicting National Standard (dow): 18 months after doa

ETSI
8 Draft ETSI EN 304 624 V1.0.0 (2026-08)
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
Introduction
The present document provides the technical cybersecurity requirements for the products in scope, following a risk-
based approach in support of the Cyber Resilience Act (CRA) [i.1]. The technical cybersecurity requirements are
thereby proportionate to the intended purpose, reasonably foreseeable use, deployment context, and threat exposure of
the products.
Clause 4 does not contain technical requirements; it describes the product context that is considered for the application
of the present document.
Clause 4 also defines Use Cases (UCs) that represent the main deployment scenarios reflecting the intended purpose
and reasonably foreseeable use of the product, which serve as the basis for identifying relevant cybersecurity risks.
Clause 5 specifies technical cybersecurity requirements for the product to mitigate the identified risks, including their
applicability conditions.
Clause 6 specifies the assessment criteria and compliance verification procedures with the requirements of Clause 5.
Annex A maps the technical requirements of the present document with the essential requirements of the CRA [i.1]
regulation.
Annex B informs about the methodology used to assess the security risks of the products in their context.
Annex K supports the definition of the cryptographic requirements and assessment criteria used by the present
document.
Annex U defines in more details the use cases contexts and parameters.

ETSI
9 Draft ETSI EN 304 624 V1.0.0 (2026-08)
1 Scope
The present document specifies technical requirements and corresponding assessment criteria for public key
infrastructure and digital certificate issuance software related to cybersecurity. The products with digital elements in
scope, thereafter "the Products":
• are specified within the "technical description" of the "category of product" number "9" by the Commission
Implementing Regulation (EU) 2025/2392 [i.2] as:
"Products with digital elements used as part of a public key infrastructure (PKI) that manage the validation,
creation, issuance, distribution, status publication, renewal or revocation of digital certificates, or the
generation, storage, escrow, exchange, destruction or rotation of cryptographic keys associated with such
digital certificates. This category includes but is not limited to key management systems, digital certificate
management systems, online certificate status protocol responders and all-in-one PKI solutions".
• are only covered within the product context described in clause 4.
The present document covers those Products to demonstrate compliance with essential cybersecurity requirements in
the Regulation (EU) 2024/2847 [i.1] Annex I Part I under the conditions identified in annex A.
Different use cases representing different product architecture are presented in clause 4.6. Requirements applicability in
clause 5 then defines which requirements apply to which use case to ensure compliance with the CRA's essential
cybersecurity requirements.
2 References
2.1 Normative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found in the
ETSI docbox.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long-term validity.
The following referenced documents are necessary for the application of the present document.
[1] ENISA Report 1747792503: "European Cybersecurity Certification Group Sub-group on
Cryptography Agreed Cryptographic Mechanisms - version 2" – April 2025.
[2] Recommendation ITU-T X.509 (10/2019): "Information technology - Open Systems
Interconnection - The Directory: Public-key and attribute certificate frameworks".
NOTE: Identical text in the defining of public-key and attribute certificates is also available in ISO/IEC 9594‑8
(paywall).
[3] IEEE Std 1609.2™-2025" "(2025): "Standard for Wireless Access in Vehicular Environments -
Security Services for Applications and Management Messages".
[4] IETF RFC 6960 (June 2013): "X.509 Internet Public Key Infrastructure Online Certificate Status
Protocol - OCSP".
2.2 Informative references
References are either specific (identified by date of publication and/or edition number or version number) or
nonspecific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
ETSI
10 Draft ETSI EN 304 624 V1.0.0 (2026-08)
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents may be useful in implementing an ETSI deliverable or add to the reader's
understanding but are not required for conformance to the present document.
[i.1] Regulation (EU) 2024/2847 of the European Parliament and of the Council of 23 October 2024 on
horizontal cybersecurity requirements for products with digital elements and amending
Regulations (EU) No 168/2013 and (EU) 2019/1020 and Directive (EU) 2020/1828 (Cyber
Resilience Act).
[i.2] Commission Implementing Regulation (EU) 2025/2392 of 28 November 2025 on the technical
description of the categories of important and critical products with digital elements pursuant to
Regulation (EU) 2024/2847 of the European Parliament and of the Council.
[i.3] Standardisation request M/606 - C(2025)618: "Commission Implementing decision of 3.2.2025 on
a standardisation request to the European Committee for Standardisation (CEN), the European
Committee for Electrotechnical Standardisation (Cenelec) and the European Telecommunications
Standards Institute (ETSI) as regards products with digital elements in support of Regulation (EU)
2024/2847 of the European Parliament and of the Council of 23 October 2024 on horizontal
cybersecurity requirements for products with digital elements and amending Regulations (EU) No
168/2013 and (EU) 2019/1020and Directive (EU) 2020/1828 (Cyber Resilience Act)".
[i.4] prEN 40000-1-1: "Cybersecurity requirements for products with digital elements - Vocabulary",
produced by CEN CENELEC.
NOTE: Version and date to be added upon its publication by CEN CENELEC.
[i.5] IETF RFC 4120: "The Kerberos Network Authentication Service (V5) - July 2005".
[i.6] ETSI GS NFV 003 (V1.4.1) (2018-08): "Network Functions Virtualisation (NFV); Terminology
for Main Concepts in NFV".
[i.7] ETSI TS 102 941 (V2.2.1) (11-2022): "Intelligent Transport Systems (ITS); Security; Trust and
Privacy Management; Re
...

SLOVENSKI STANDARD
01-oktober-2026
Kibernetska varnost (CYBER) - CRA - Zahteve za kibernetsko varnost za
infrastrukturo javnih ključev in programsko opremo za izdajanje digitalnih potrdil
Cyber Security (CYBER) - CRA - Cybersecurity requirements for Public key
infrastructure and digital certificate issuance software
Ta slovenski standard je istoveten z: ETSI EN 304 624 V1.0.0 (2026-08)
ICS:
35.030 Informacijska varnost IT Security
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

Draft ETSI EN 304 624 V1.0.0 (2026-08)
HARMONISED EUROPEAN STANDARD
Cyber security (CYBER);
CRA;
Cybersecurity requirements for public key infrastructure and
digital certificate issuance software

2 Draft ETSI EN 304 624 V1.0.0 (2026-08)

Reference
DEN/CYBER-EUS-0015
Keywords
certificate, CRA, cybersecurity, public key
infrastructure
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE

Tel.: [phone]  Fax: [phone]

Siret N° 348 623 562 00017 - APE 7112B
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° w061004871

Important notice
The present document can be downloaded from the
ETSI Search & Browse Standards application.
The present document may be made available in electronic versions and/or in print. The content of any electronic and/or
print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any
existing or perceived difference in contents between such versions and/or in print, the prevailing version of an ETSI
deliverable is the one made publicly available in PDF format on ETSI deliver repository.
Users should be aware that the present document may be revised or have its status changed,
this information is available in the Milestones listing.
If you find errors in the present document, please send your comments to
the relevant service listed under Committee Support Staff.
If you find a security vulnerability in the present document, please report it through our
Coordinated Vulnerability Disclosure (CVD) program.
Notice of disclaimer & limitation of liability
The information provided in the present deliverable is directed solely to professionals who have the appropriate degree of
experience to understand and interpret its content in accordance with generally accepted engineering or
other professional standard and applicable regulations.
No recommendation as to products and services or vendors is made or should be implied.
In no event shall ETSI be held liable for loss of profits or any other incidental or consequential damages.

Any software contained in this deliverable is provided "AS IS" with no warranties, express or implied, including but not
limited to, the warranties of merchantability, fitness for a particular purpose and non-infringement of intellectual property
rights and ETSI shall not be held liable in any event for any damages whatsoever (including, without limitation, damages
for loss of profits, business interruption, loss of information, or any other pecuniary loss) arising out of or related to the use
of or inability to use the software.
Copyright Notification
No part of this document may be reproduced in any form, by any means and in any media, without the prior written
authorization of ETSI and except as expressly permitted below.
By way of exception and when the document is a normative deliverable (European Standard (EN),
Technical Specification (TS), Group Specification (GS) or ETSI Standard (ES)), ETSI authorizes to reproduce
and incorporate into products, services and technical documentation only those extracts (e.g. templates) that are strictly
necessary for the technical implementation of the normative deliverable, to ensure compliance with the latter.
Nothing in this notice shall be construed as limiting any mandatory exceptions to copyright provided by applicable law.

© ETSI 2026.
All rights reserved.
ETSI
3 Draft ETSI EN 304 624 V1.0.0 (2026-08)
Contents
Introduction . 8
1 Scope . 9
2 References . 9
2.1 Normative references . 9
2.2 Informative references . 9
3 Definition of terms, symbols and abbreviations . 11
3.1 Terms . 11
3.2 Symbols . 12
3.3 Abbreviations . 12
4 Product context . 13
4.0 Introduction . 13
4.1 Product Functions . 14
4.2 Product Architecture. 15
4.3 Operational Environment . 17
4.3.1 General description . 17
4.3.2 Physical/Hardware environment . 17
4.3.3 Logical/Software environment. 17
4.3.4 Connectivity aspects . 17
4.4 Distribution of Security Functions . 18
4.5 Users . 18
4.6 Use cases . 18
4.6.1 Private PKI for non critical sectors (UC1) . 19
4.6.2 Private PKI for critical entities (UC2) . 19
4.6.3 Public PKI for critical entities (UC3) . 19
4.6.4 Public basic PKI for critical entities (UC4) . 20
4.6.5 Multi-authority PKI for critical entities (UC5) . 20
5 Technical requirements for the products . 20
5.1 Introduction - Applicability of the requirements . 20
5.2 No known exploitable vulnerabilities . 21
5.3 Secure by default configuration . 21
5.3.1 SDBC- Access control . 21
5.3.2 SBDC- Monitoring . 21
5.3.3 SBDC- Cryptography . 21
5.3.4 SBDC- Certificates . 22
5.4 Secure updates . 22
5.5 Authentication and access control . 22
5.6 Confidentiality . 23
5.6.1 CON - General . 23
5.6.2 CON - Secure storage and communications . 25
5.6.3 CON - Key management . 25
5.7 Integrity . 25
5.7.1 INT - Monitoring . 25
5.7.2 INT - Certificate signing . 27
5.7.3 INT- CRL signing . 27
5.8 Data minimisation . 27
5.8.1 DM - General . 28
5.8.2 DM - Secret management . 28
5.9 Availability protection . 28
5.9.1 AP - Certificate suspension and revocation . 28
5.9.2 AP - Certificate status services . 29
5.9.3 AP - Key management . 30
5.10 Impact minimisation . 30
5.11 Minimisation of attack surfaces . 30
5.12 Exploitation mitigation mechanisms . 31
5.12.1 EMM - Certificate issuance . 31
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4 Draft ETSI EN 304 624 V1.0.0 (2026-08)
5.12.2 EMM - Certificate status . 33
5.12.3 EMM - Certificate re-key . 34
5.12.4 EMM - Certificate modification . 34
5.13 Logging and monitoring . 34
5.14 Data removal and transparency . 35
5.14.1 DRT - Secret management . 36
6 Assessment criteria for compliance with technical requirements . 36
6.1 Introduction to the assessment and compliance criteria . 36
6.2 No known exploitable vulnerabilities . 38
6.3 Secure by default configuration . 39
6.3.1 SBDC - Access control . 39
6.3.2 SBDC - Monitoring . 40
6.3.3 SBDC - Cryptography . 41
6.3.4 SBDC - Certificates . 42
6.4 Secure updates . 43
6.5 Authentication and access control . 45
6.5.1 AC - General . 45
6.6 Confidentiality . 46
6.6.1 CON - General . 47
6.6.2 CON - Secure storage and communications . 50
6.6.3 CON - Key management . 51
6.7 Integrity . 53
6.7.1 INT - Monitoring . 53
6.7.2 INT - Certificate signing . 56
6.7.3 INT- CRL signing . 57
6.8 Data minimisation . 58
6.8.1 General . 58
6.8.2 DM - Secret management . 61
6.9 Availability protection . 62
6.9.1 AP - Certificate suspension and revocation . 62
6.9.2 AP - Certificate status services . 65
6.9.3 AP - Key management . 67
6.10 Impact minimisation . 68
6.11 Minimisation of attack surfaces . 69
6.12 Exploitation mitigation mechanisms . 70
6.12.1 EMM - Certificate issuance . 70
6.12.2 EMM - Certificate status . 75
6.12.3 EMM - Certificate re-key . 78
6.12.4 EMM - Certificate modification . 78
6.13 Logging and monitoring . 79
6.14 Data removal and transparency . 83
Annex A (informative): Relationship between the present document and the requirements of
EU Regulation (EU) 2024/2847 – the Cyber Resilience Act . 86
Annex B (informative): Security analysis . 89
B.1 Risk calculation . 89
B.2 Risk Assessment . 90
B.2.1 Likelihood risk factors . 90
B.2.1.1 Deployment . 90
B.2.1.2 Network and Physical security . 91
B.2.1.3 User expertise . 91
B.2.1.4 Interface exposure . 91
B.2.2 Impact risk factors . 91
B.3 Evaluate Risks . 91
B.4 Requirements applicability - threats mapping rational . 100
Annexes C to J: Void . 110
Annex K (normative): Generic cryptographic requirements and assessment . 111
K.1 Cryptography . 111
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5 Draft ETSI EN 304 624 V1.0.0 (2026-08)
K.1.1 Requirement . 111
K.1.2 Assessment of product cryptographic configuration . 112
K.1.2.0 General . 112
K.1.2.1 Assessment of ACM-listed cryptographic mechanisms. 112
K.1.2.1.1 Assessment objective . 112
K.1.2.1.2 Assessment preparation . 112
K.1.2.1.3 Assessment activities . 112
K.1.2.1.4 Assessment evidence . 112
K.1.2.1.5 Assessment verdict . 113
K.1.2.2 Assessment of ACM-extended cryptographic mechanisms . 113
K.1.2.2.1 Assessment objective . 113
K.1.2.2.2 Assessment preparation . 113
K.1.2.2.3 Assessment activities . 113
K.1.2.2.4 Assessment evidence . 114
K.1.2.2.5 Assessment verdict . 114
K.1.2.3 Assessment of interoperability-based cryptographic mechanisms . 114
K.1.2.3.1 Assessment objective . 114
K.1.2.3.2 Assessment preparation . 114
K.1.2.3.3 Assessment activities . 114
K.1.2.3.4 Assessment evidence . 115
K.1.2.3.5 Assessment verdict . 115
K.2 Crypto agility . 115
K.2.1 Requirement . 115
K.2.2 Assessment of crypto-agility . 116
K.2.2.1 Assessment objective . 116
K.2.2.2 Assessment preparation . 116
K.2.2.3 Assessment activities . 117
K.2.2.4 Assessment evidence . 117
K.2.2.5 Assessment verdict . 117
K.3 ACM-extended cryptographic mechanisms . 117
K.3.1 Requirement . 117
K.3.2 List of ACM-extended cryptographic mechanisms . 118
K.3.3 Assessment . 118
K.4 Interoperability-based cryptographic mechanisms . 118
K.4.1 Requirement . 118
K.4.2 List of interoperability-based cryptographic mechanisms . 118
K.4.3 Assessment . 118
Annexes I to T: Void . 119
Annex U (informative): Use case description . 120
U.1 UC1 - Product for use in Private PKI for non critical sectors . 120
U.1.1 UC1 - General description . 120
U.1.2 UC1 - Product Functions and assets . 122
U.1.2.1 UC1 - List of functions . 122
U.1.2.2 UC1 - Assets . 123
U.1.3 UC1 - Operational Environment . 123
U.1.4 UC1 - Distribution of Security Functions. 123
U.1.5 UC1 - Users . 124
U.2 UC2 - Product for use in Private PKI for critical entities . 124
U.2.1 UC2 - General description . 124
U.2.2 UC2 - List of functions . 126
U.2.2.1 UC2 - Assets . 127
U.2.3 UC2 - Operational Environment . 127
U.2.4 UC2 - Distribution of Security Functions. 128
U.2.5 UC2 - Users . 128
U.3 UC3 - Public PKI for critical entities . 128
U.3.1 General description. 128
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U.3.2 UC3 - List of functions . 129
U.3.2.1 UC3 - Assets . 130
U.3.3 UC3 - Operational Environment . 130
U.3.4 UC3 - Distribution of Security Functions. 131
U.3.5 UC3 - Users . 131
U.4 UC4 - Product for use in Critical Public basic PKI . 131
U.4.1 UC4 - General description . 131
U.4.2 UC4 - List of functions . 133
U.4.2.1 UC4 - Assets . 133
U.4.3 UC4 - Operational Environment . 134
U.4.4 UC4 - Distribution of Security Functions. 134
U.4.5 UC4 - Users . 134
U.5 UC5 - Product for use in Critical Multi-Authority PKI . 134
U.5.1 General description. 134
U.5.2 UC5 - List of functions . 136
U.5.2.1 UC5 - Assets . 137
U.5.3 UC5 - Operational Environment . 138
U.5.4 UC5 - Distribution of Security Functions. 138
U.5.5 UC5 - Users . 138
Annex V (informative): Change history . 139
History . 141

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7 Draft ETSI EN 304 624 V1.0.0 (2026-08)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables (European Standard (EN), Technical Specification (TS),
Group Specification (GS) or ETSI Standard (ES)) may have been declared to ETSI. The declarations pertaining to these
essential IPRs, if any, are publicly available for ETSI members and non-members, and can be found in
ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the
ETSI IPR online database.
Pursuant to the ETSI Directives including the ETSI IPR Policy, no investigation regarding the essentiality of IPRs,
including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not
referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become,
essential to the present document.
Trademarks
The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners.
ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does
not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks.
DECT™, PLUGTESTS™, UMTS™ and the ETSI logo are trademarks of ETSI registered for the benefit of its
Members. 3GPP™, LTE™ and 5G™ logo are trademarks of ETSI registered for the benefit of its Members and of the
3GPP Organizational Partners. oneM2M™ logo is a trademark of ETSI registered for the benefit of its Members and of ®
the oneM2M Partners. GSM and the GSM logo are trademarks registered and owned by the GSM Association.
Foreword
This draft Harmonised European Standard (EN) has been produced by ETSI Technical Committee Cyber Security
(CYBER), and is now submitted for the combined Public Enquiry and Vote phase of the ETSI Standardisation Request
deliverable Approval Procedure (SRdAP).
The present document has been prepared under the Commission's Standardisation request M/606 - C(2025)618 [i.3] to
provide one voluntary means of conforming to the requirements of EU Regulation No 2024/2847 of the European
Parliament and of the Council of 23 October 2024 on horizontal cybersecurity requirements for products with digital
elements and amending Regulations (EU) No 168/2013 and (EU) No 2019/1020 and Directive (EU) 2020/1828 (Cyber
Resilience Act) (CRA) [i.1].
Once the present document is cited in the Official Journal of the European Union under that Regulation, compliance
with the normative clauses of the present document given in Table A.1 confers, within the limits of the scope of the
present document, a presumption of conformity with the corresponding requirements of that Regulation and associated
EFTA regulations.
Proposed national transposition dates
Date of latest announcement of this EN (doa): 3 months after ETSI publication
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 6 months after doa
Date of withdrawal of any conflicting National Standard (dow): 18 months after doa

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8 Draft ETSI EN 304 624 V1.0.0 (2026-08)
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
Introduction
The present document provides the technical cybersecurity requirements for the products in scope, following a risk-
based approach in support of the Cyber Resilience Act (CRA) [i.1]. The technical cybersecurity requirements are
thereby proportionate to the intended purpose, reasonably foreseeable use, deployment context, and threat exposure of
the products.
Clause 4 does not contain technical requirements; it describes the product context that is considered for the application
of the present document.
Clause 4 also defines Use Cases (UCs) that represent the main deployment scenarios reflecting the intended purpose
and reasonably foreseeable use of the product, which serve as the basis for identifying relevant cybersecurity risks.
Clause 5 specifies technical cybersecurity requirements for the product to mitigate the identified risks, including their
applicability conditions.
Clause 6 specifies the assessment criteria and compliance verification procedures with the requirements of Clause 5.
Annex A maps the technical requirements of the present document with the essential requirements of the CRA [i.1]
regulation.
Annex B informs about the methodology used to assess the security risks of the products in their context.
Annex K supports the definition of the cryptographic requirements and assessment criteria used by the present
document.
Annex U defines in more details the use cases contexts and parameters.

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9 Draft ETSI EN 304 624 V1.0.0 (2026-08)
1 Scope
The present document specifies technical requirements and corresponding assessment criteria for public key
infrastructure and digital certificate issuance software related to cybersecurity. The products with digital elements in
scope, thereafter "the Products":
• are specified within the "technical description" of the "category of product" number "9" by the Commission
Implementing Regulation (EU) 2025/2392 [i.2] as:
"Products with digital elements used as part of a public key infrastructure (PKI) that manage the validation,
creation, issuance, distribution, status publication, renewal or revocation of digital certificates, or the
generation, storage, escrow, exchange, destruction or rotation of cryptographic keys associated with such
digital certificates. This category includes but is not limited to key management systems, digital certificate
management systems, online certificate status protocol responders and all-in-one PKI solutions".
• are only covered within the product context described in clause 4.
The present document covers those Products to demonstrate compliance with essential cybersecurity requirements in
the Regulation (EU) 2024/2847 [i.1] Annex I Part I under the conditions identified in annex A.
Different use cases representing different product architecture are presented in clause 4.6. Requirements applicability in
clause 5 then defines which requirements apply to which use case to ensure compliance with the CRA's essential
cybersecurity requirements.
2 References
2.1 Normative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found in the
ETSI docbox.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long-term validity.
The following referenced documents are necessary for the application of the present document.
[1] ENISA Report 1747792503: "European Cybersecurity Certification Group Sub-group on
Cryptography Agreed Cryptographic Mechanisms - version 2" – April 2025.
[2] Recommendation ITU-T X.509 (10/2019): "Information technology - Open Systems
Interconnection - The Directory: Public-key and attribute certificate frameworks".
NOTE: Identical text in the defining of public-key and attribute certificates is also available in ISO/IEC 9594‑8
(paywall).
[3] IEEE Std 1609.2™-2025" "(2025): "Standard for Wireless Access in Vehicular Environments -
Security Services for Applications and Management Messages".
[4] IETF RFC 6960 (June 2013): "X.509 Internet Public Key Infrastructure Online Certificate Status
Protocol - OCSP".
2.2 Informative references
References are either specific (identified by date of publication and/or edition number or version number) or
nonspecific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
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10 Draft ETSI EN 304 624 V1.0.0 (2026-08)
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents may be useful in implementing an ETSI deliverable or add to the reader's
understanding but are not required for conformance to the present document.
[i.1] Regulation (EU) 2024/2847 of the European Parliament and of the Council of 23 October 2024 on
horizontal cybersecurity requirements for products with digital elements and amending
Regulations (EU) No 168/2013 and (EU) 2019/1020 and Directive (EU) 2020/1828 (Cyber
Resilience Act).
[i.2] Commission Implementing Regulation (EU) 2025/2392 of 28 November 2025 on the technical
description of the categories of important and critical products with digital elements pursuant to
Regulation (EU) 2024/2847 of the European Parliament and of the Council.
[i.3] Standardisation request M/606 - C(2025)618: "Commission Implementing decision of 3.2.2025 on
...