SIST EN 319 421 V1.2.1:2023
(Main)Electronic Signatures and Infrastructures (ESI) - Policy and Security Requirements for Trust Service Providers issuing Time-Stamps
Electronic Signatures and Infrastructures (ESI) - Policy and Security Requirements for Trust Service Providers issuing Time-Stamps
The present document specifies policy and security requirements relating to the operation and management practices of
TSPs issuing time-stamps.
These policy requirements are applicable to TSPs issuing time-stamps. Such time-stamps can be used in support of
digital signatures or for any application requiring to prove that a datum existed before a particular time.
The present document can be used by independent bodies as the basis for confirming that a TSP can be trusted for
issuing time-stamps.
The present document does not specify protocols used to access the TSUs.
NOTE 1: A time-stamping protocol is defined in IETF RFC 3161 [i.2] including optional update in IETF
RFC 5816 [i.3] and profiled in ETSI EN 319 422 [5].
The present document does not specify how the requirements identified can be assessed by an independent party,
including requirements for information to be made available to such independent assessors, or requirements on such
assessors.
NOTE 2: See ETSI EN 319 403-1 [i.9] for guidance on assessment of TSP's processes and services.
NOTE 3: The present document references ETSI EN 319 401 [4] for general policy requirements common to all
classes of TSP's services.
Elektronski podpisi in infrastruktura (ESI) - Zahteve politike in varnosti za ponudnike storitev zaupanja, ki izdajajo časovne žige
Ta dokument določa zahteve politike in varnosti za delovanje in upravljanje ponudnikov storitev zaupanja, ki izdajajo časovne žige.
Te zahteve politike se uporabljajo za ponudnike storitev zaupanja, ki izdajajo časovne žige. Tovrstni časovni žigi se lahko uporabljajo kot podpora za digitalne podpise ali za kateri koli način uporabe, pri katerem se zahteva dokazilo, da je datum že obstajal pred določenim časom.
Neodvisni organi lahko ta dokument uporabijo kot podlago za potrjevanje, da lahko ponudnik storitev zaupanja zanesljivo izdaja časovne žige.
Ta dokument ne določa protokolov za dostop do uporabnikov storitev zaupanja (TSU).
OPOMBA 1: Protokol za časovno žigosanje je določen v standardu IETF RFC 3161 [i.2], vključno z izbirno posodobitvijo v standardu IETF
RFC 5816 [i.3] in profilom v standardu ETSI EN 319 422 [5].
Ta dokument ne določa, kako lahko opredeljene zahteve oceni neodvisna stran, vključno z zahtevami glede informacij, ki jih je treba razkriti takim neodvisnim ocenjevalcem, ali zahtevami glede takih ocenjevalcev.
OPOMBA 2: Glej standard ETSI EN 319 403-1 [i.9] za navodila v zvezi z ocenjevanjem procesov in storitev ponudnikov storitev zaupanja.
OPOMBA 3: Ta dokument se sklicuje na standard ETSI EN 319 401 [4] za splošne zahteve politike, ki so skupne vsem razredom storitev ponudnikov storitev zaupanja.
General Information
Buy Standard
Standards Content (Sample)
ETSI EN 319 421 V1.2.1 (2023-05)
EUROPEAN STANDARD
Electronic Signatures and Infrastructures (ESI);
Policy and Security Requirements for
Trust Service Providers issuing Time-Stamps
---------------------- Page: 1 ----------------------
2 ETSI EN 319 421 V1.2.1 (2023-05)
Reference
REN/ESI-0019421v1.2.1
Keywords
e-commerce, electronic signature, security,
time-stamping, trust services
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE
Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16
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:
https://www.etsi.org/standards-search
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 at www.etsi.org/deliver.
Users of the present document should be aware that the document may be subject to revision or change of status.
Information on the current status of this and other ETSI documents is available at
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If you find errors in the present document, please send your comment to one of the following services:
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If you find a security vulnerability in the present document, please report it through our
Coordinated Vulnerability Disclosure Program:
https://www.etsi.org/standards/coordinated-vulnerability-disclosure
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 may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and
microfilm except as authorized by written permission of ETSI.
The content of the PDF version shall not be modified without the written authorization of ETSI.
The copyright and the foregoing restriction extend to reproduction in all media.
© ETSI 2023.
All rights reserved.
ETSI
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3 ETSI EN 319 421 V1.2.1 (2023-05)
Contents
Intellectual Property Rights . 5
Foreword . 5
Modal verbs terminology . 5
Introduction . 6
1 Scope . 7
2 References . 7
2.1 Normative references . 7
2.2 Informative references . 8
3 Definitions of terms, symbols, abbreviations and notation . 9
3.1 Terms . 9
3.2 Symbols . 9
3.3 Abbreviations . 10
3.4 Notation . 10
4 General concepts . 11
4.1 General policy requirements concepts . 11
4.2 Time-stamping services . 11
4.3 Time-Stamping Authority (TSA) . 11
4.4 Subscriber . 11
4.5 Time-stamp policy and TSA practice statement . 12
5 Introduction to time-stamp policies and general requirements . 12
5.1 General requirements . 12
5.2 Policy name and identification . 12
5.3 User community and applicability . 13
5.3.1 Best practices time-stamp policy . 13
6 Policies and practices . 13
6.1 Risk assessment . 13
6.2 Trust Service Practice Statement . 13
6.3 Terms and conditions . 13
6.4 Information security policy . 13
6.5 TSA obligations . 14
6.5.1 General . 14
6.5.2 TSA obligations towards subscribers . 14
6.6 Information for relying parties . 14
7 TSA management and operation . 14
7.1 Introduction . 14
7.2 Internal organization. 14
7.3 Personnel security. 15
7.4 Asset management . 15
7.5 Access control . 15
7.6 Cryptographic controls . 15
7.6.1 General . 15
7.6.2 TSU key generation . 15
7.6.3 TSU private key protection . 16
7.6.4 TSU public key certificate . 16
7.6.5 Rekeying TSU's key . 17
7.6.6 Life cycle management of signing cryptographic hardware . 17
7.6.7 End of TSU key life cycle . 17
7.7 Time-stamping . 18
7.7.1 Time-stamp issuance. 18
7.7.2 Clock synchronization with UTC . 18
7.8 Physical and environmental security . 19
7.9 Operation security . 19
ETSI
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4 ETSI EN 319 421 V1.2.1 (2023-05)
7.10 Network security . 20
7.11 Incident management . 20
7.12 Collection of evidence . 20
7.13 Business continuity management . 20
7.14 TSA termination and termination plans . 21
7.15 Compliance. 21
8 Additional requirements for qualified electronic time-stamps as per Regulation (EU) No 910/2014 . 21
8.1 TSU public key certificate . 21
8.2 TSA issuing non-qualified and qualified electronic time-stamps as per Regulation (EU) No 910/2014 . 21
Annex A (informative): Potential liability in the provision of time-stamping services . 22
Annex B (informative): Model TSA disclosure statement . 23
B.1 Introduction . 23
B.2 TSA disclosure statement structure . 23
Annex C (informative): Coordinated Universal Time (UTC). 25
Annex D (informative): Long term verification of time-stamps . 26
Annex E (informative): Regulation (EU) No 910/2014 and qualified electronic time-stamp
policy cross-reference . 27
Annex F (informative): Possible implementation architectures - time-stamping service . 28
F.1 Managed time-stamping service . 28
F.2 Selective alternative quality . 28
Annex G (informative): Major changes from ETSI TS 102 023 . 30
Annex H (informative): Conformity Assessment Check list . 31
Annex I (informative): Change History . 32
History . 33
ETSI
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5 ETSI EN 319 421 V1.2.1 (2023-05)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables 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 Web server (https://ipr.etsi.org/).
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™ and LTE™ 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 European Standard (EN) has been produced by ETSI Technical Committee Electronic Signatures and
Infrastructures (ESI).
The present document is derived from the requirements specified in ETSI TS 102 023 [i.8].
National transposition dates
Date of adoption of this EN: 1 May 2023
Date of latest announcement of this EN (doa): 31 August 2023
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 29 February 2024
Date of withdrawal of any conflicting National Standard (dow): 29 February 2024
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.
ETSI
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6 ETSI EN 319 421 V1.2.1 (2023-05)
Introduction
The present document is aiming to meet the general requirements of the international community to provide trust and
confidence in electronic transactions including, amongst others, applicable requirements from Regulation (EU)
No 910/2014 [i.4].
The Regulation includes requirements for Trust Service Providers (TSP) providing services to the public, including
TSPs issuing time-stamps. Additionally, more specific requirements are identified in the Regulation for a specific class
of TSP called a Qualified TSP, with further specific requirements for those Qualified TSPs which issue qualified
time-stamps. The present document is aimed to meet the requirements of the Regulation for both Qualified and
non-Qualified TSPs issuing Qualified and non-Qualified electronic time-stamps respectively.
In order to verify an electronic signature, it can be necessary to prove that the signature from the signer was applied
when the signer's certificate was valid. This is necessary in two circumstances:
1) during the validity period of the signer's certificate, should the signer's certificate be revoked before the end of
its validity, e.g. because the signer's private key has been compromised;
2) after the end of the validity period of the signer's certificate, since CAs are not mandated to process revocation
status information beyond the end of the validity period of the certificates they have issued.
One method consists to use a time-stamp which allows proving that a datum existed before a particular time. This
technique allows proving that the signature was generated before the date contained in the time-stamp. Policy
requirements to cover that case are the primary aim of the present document.
However, these policy requirements allow addressing other needs.
Time-stamping is gaining an increasing interest by the business sector and is becoming an important component of
digital signatures, this is commonly based upon the Time-Stamp protocol from the IETF RFC 3161 [i.2] which is
profiled in ETSI EN 319 422 [5]. Agreed minimum security and quality requirements are necessary in order to ensure
trustworthy validation of long-term digital signatures.
ETSI
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7 ETSI EN 319 421 V1.2.1 (2023-05)
1 Scope
The present document specifies policy and security requirements relating to the operation and management practices of
TSPs issuing time-stamps.
These policy requirements are applicable to TSPs issuing time-stamps. Such time-stamps can be used in support of
digital signatures or for any application requiring to prove that a datum existed before a particular time.
The present document can be used by independent bodies as the basis for confirming that a TSP can be trusted for
issuing time-stamps.
The present document does not specify protocols used to access the TSUs.
NOTE 1: A time-stamping protocol is defined in IETF RFC 3161 [i.2] including optional update in IETF
RFC 5816 [i.3] and profiled in ETSI EN 319 422 [5].
The present document does not specify how the requirements identified can be assessed by an independent party,
including requirements for information to be made available to such independent assessors, or requirements on such
assessors.
NOTE 2: See ETSI EN 319 403-1 [i.9] for guidance on assessment of TSP's processes and services.
NOTE 3: The present document references ETSI EN 319 401 [4] for general policy requirements common to all
classes of TSP's services.
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 at
https://docbox.etsi.org/Reference.
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] Recommendation ITU-R TF.460-6 (2002): "Standard-frequency and time-signal emissions".
[2] ISO/IEC 19790:2012: "Information technology -- Security techniques -- Security requirements for
cryptographic modules".
[3] ISO/IEC 15408 (parts 1 to 3): "Information security, cybersecurity and privacy protection --
Evaluation criteria for IT security ".
[4] ETSI EN 319 401: "Electronic Signatures and Infrastructures (ESI); General Policy Requirements
for Trust Service Providers".
[5] ETSI EN 319 422: "Electronic Signatures and Infrastructures (ESI); Time-stamping protocol and
time-stamp token profiles".
[6] FIPS PUB 140-2 (2002): "Security Requirements for Cryptographic Modules".
[7] FIPS PUB 140-3 (2019): "Security Requirements for Cryptographic Modules".
ETSI
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8 ETSI EN 319 421 V1.2.1 (2023-05)
2.2 Informative 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.
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 not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
[i.1] ETSI EN 319 122-1: "Electronic Signatures and Infrastructures (ESI); CAdES digital signatures;
Part 1: Building blocks and CAdES baseline signatures".
[i.2] IETF RFC 3161 (2001): "Internet X.509 Public Key Infrastructure: Time-Stamp Protocol (TSP)".
[i.3] IETF RFC 5816: "ESSCertIDV2 update to RFC 3161".
[i.4] Regulation (EU) No 910/2014 of the European Parliament and of the Council on electronic
identification and trust services for electronic transactions in the internal market and repealing
Directive 1999/93/EC.
[i.5] Council Directive 93/13/EEC of 5 April 1993 on unfair terms in consumer contracts.
[i.6] BIPM Circular T.
NOTE: Available from the BIPM website https://www.bipm.org/.
[i.7] ETSI TS 119 312: "Electronic Signatures and Infrastructures (ESI); Cryptographic Suites".
[i.8] ETSI TS 102 023: "Electronic Signatures and Infrastructures (ESI); Policy requirements for time-
stamping authorities".
[i.9] ETSI EN 319 403-1: "Electronic Signatures and Infrastructures (ESI); Trust Service Provider
Conformity Assessment; Part 1: Requirements for conformity assessment bodies assessing Trust
Service Providers".
[i.10] ETSI EN 319 411-1: "Electronic Signatures and Infrastructures (ESI); Policy and security
requirements for Trust Service Providers issuing certificates; Part 1: General requirements".
[i.11] ETSI EN 319 411-2: "Electronic Signatures and Infrastructures (ESI); Policy and security
requirements for Trust Service Providers issuing certificates; Part 2: Requirements for trust service
providers issuing EU qualified certificates".
[i.12] EN 419231: "Protection profile for trustworthy systems supporting time stamping", (produced by
CEN).
[i.13] TS 419221-2: "Protection profiles for TSP Cryptographic modules - Part 2: Cryptographic module
for CSP signing operations with backup", (produced by CEN).
[i.14] TS 419221-3: "Protection profiles for TSP Cryptographic modules - Part 3: Cryptographic module
for CSP key generation services", (produced by CEN).
[i.15] TS 419221-4: "Protection profiles for TSP Cryptographic modules - Part 4: Cryptographic module
for CSP signing operations without backup", (produced by CEN).
[i.16] EN 419221-5: "Protection profiles for TSP Cryptographic modules - Part 5: Cryptographic module
for trust services", (produced by CEN).
[i.17] ETSI TS 119 612: "Electronic Signatures and Infrastructures (ESI); Trusted Lists".
ETSI
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9 ETSI EN 319 421 V1.2.1 (2023-05)
3 Definitions of terms, symbols, abbreviations and
notation
3.1 Terms
For the purposes of the present document, the terms given ETSI EN 319 401 [4] and the following apply:
NOTE: Where a definition is copied from a referenced document this is indicated by inclusion of the reference
identifier number at the end of the definition.
Coordinated Universal Time (UTC): time scale based on the second as defined in Recommendation ITU-R
TF.460-6 [1]
NOTE: For most practical purposes UTC is equivalent to mean solar time at the prime meridian (0°). More
specifically, UTC is a compromise between the highly stable atomic time (Temps Atomique International
- TAI) and solar time derived from the irregular Earth rotation (related to the Greenwich Mean Sidereal
Time (GMST) by a conventional relationship) (see annex C for more details).
relying party: recipient of a time-stamp who relies on that time-stamp
subscriber: legal or natural person to whom a time-stamp is issued and who is bound to any subscriber obligations
time-stamp: data in electronic form which binds other electronic data to a particular time establishing evidence that
these data existed at that time
time-stamp policy: named set of rules that indicates the applicability of a time-stamp to a particular community and/or
class of application with common security requirements
NOTE: This is a specific type of trust service policy as defined in ETSI EN 319 401 [4].
Time-Stamping Authority (TSA): TSP providing time-stamping services using one or more time-stamping units
time-stamping service: trust service for issuing time-stamps
Time-Stamping Unit (TSU): set of hardware and software which is managed as a unit and has a single time-stamp
signing key active at a time
trust service: electronic service that enhances trust and confidence in electronic transactions
Trust Service Provider (TSP): entity which provides one or more trust services
TSA Disclosure statement: set of statements about the policies and practices of a TSA that particularly require
emphasis or disclosure to subscribers and relying parties, for example to meet regulatory requirements
TSA practice statement: statement of the practices that a TSA employs in issuing time-stamp
NOTE: This is a specific type of trust service practice statement as defined in ETSI EN 319 401 [4].
TSA system: composition of IT products and components organized to support the provision of time-stamping services
UTC(k): time scale realized by the laboratory "k" and kept in close agreement with UTC, with the goal to reach
±100 ns
NOTE: A list of UTC(k) laboratories is given in clause 1 of Circular T [i.6] disseminated by BIPM and available
from the BIPM website (https://www.bipm.org/).
3.2 Symbols
Void.
ETSI
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10 ETSI EN 319 421 V1.2.1 (2023-05)
3.3 Abbreviations
For the purposes of the present document, the abbreviations given in ETSI EN 319 401 [4] and the following apply:
BIPM Bureau International des Poids et Mesures
BTSP Best practices Time-Stamp Policy
CA Certification Authority
IERS International Earth Rotation and Reference System Service
IT Information Technology
OVR General requirement
TAI International Atomic Time
TIS Time-stamp Issuance Services
TSA Time-Stamping Authority
TSP Trust Service Provider
TSU Time-Stamping Unit
UTC Coordinated Universal Time
3.4 Notation
The requirements identified in the present document include:
a) Requir
...
SLOVENSKI STANDARD
SIST EN 319 421 V1.2.1:2023
01-junij-2023
Elektronski podpisi in infrastruktura (ESI) - Zahteve politike in varnosti za
ponudnike storitev zaupanja, ki izdajajo časovne žige
Electronic Signatures and Infrastructures (ESI) - Policy and Security Requirements for
Trust Service Providers issuing Time-Stamps
Ta slovenski standard je istoveten z: ETSI EN 319 421 V1.2.1 (2023-05)
ICS:
35.030 Informacijska varnost IT Security
35.040.01 Kodiranje informacij na Information coding in general
splošno
SIST EN 319 421 V1.2.1:2023 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
SIST EN 319 421 V1.2.1:2023
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SIST EN 319 421 V1.2.1:2023
ETSI EN 319 421 V1.2.1 (2023-05)
EUROPEAN STANDARD
Electronic Signatures and Infrastructures (ESI);
Policy and Security Requirements for
Trust Service Providers issuing Time-Stamps
---------------------- Page: 3 ----------------------
SIST EN 319 421 V1.2.1:2023
2 ETSI EN 319 421 V1.2.1 (2023-05)
Reference
REN/ESI-0019421v1.2.1
Keywords
e-commerce, electronic signature, security,
time-stamping, trust services
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE
Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16
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:
https://www.etsi.org/standards-search
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 at www.etsi.org/deliver.
Users of the present document should be aware that the document may be subject to revision or change of status.
Information on the current status of this and other ETSI documents is available at
https://portal.etsi.org/TB/ETSIDeliverableStatus.aspx
If you find errors in the present document, please send your comment to one of the following services:
https://portal.etsi.org/People/CommiteeSupportStaff.aspx
If you find a security vulnerability in the present document, please report it through our
Coordinated Vulnerability Disclosure Program:
https://www.etsi.org/standards/coordinated-vulnerability-disclosure
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 may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and
microfilm except as authorized by written permission of ETSI.
The content of the PDF version shall not be modified without the written authorization of ETSI.
The copyright and the foregoing restriction extend to reproduction in all media.
© ETSI 2023.
All rights reserved.
ETSI
---------------------- Page: 4 ----------------------
SIST EN 319 421 V1.2.1:2023
3 ETSI EN 319 421 V1.2.1 (2023-05)
Contents
Intellectual Property Rights . 5
Foreword . 5
Modal verbs terminology . 5
Introduction . 6
1 Scope . 7
2 References . 7
2.1 Normative references . 7
2.2 Informative references . 8
3 Definitions of terms, symbols, abbreviations and notation . 9
3.1 Terms . 9
3.2 Symbols . 9
3.3 Abbreviations . 10
3.4 Notation . 10
4 General concepts . 11
4.1 General policy requirements concepts . 11
4.2 Time-stamping services . 11
4.3 Time-Stamping Authority (TSA) . 11
4.4 Subscriber . 11
4.5 Time-stamp policy and TSA practice statement . 12
5 Introduction to time-stamp policies and general requirements . 12
5.1 General requirements . 12
5.2 Policy name and identification . 12
5.3 User community and applicability . 13
5.3.1 Best practices time-stamp policy . 13
6 Policies and practices . 13
6.1 Risk assessment . 13
6.2 Trust Service Practice Statement . 13
6.3 Terms and conditions . 13
6.4 Information security policy . 13
6.5 TSA obligations . 14
6.5.1 General . 14
6.5.2 TSA obligations towards subscribers . 14
6.6 Information for relying parties . 14
7 TSA management and operation . 14
7.1 Introduction . 14
7.2 Internal organization. 14
7.3 Personnel security. 15
7.4 Asset management . 15
7.5 Access control . 15
7.6 Cryptographic controls . 15
7.6.1 General . 15
7.6.2 TSU key generation . 15
7.6.3 TSU private key protection . 16
7.6.4 TSU public key certificate . 16
7.6.5 Rekeying TSU's key . 17
7.6.6 Life cycle management of signing cryptographic hardware . 17
7.6.7 End of TSU key life cycle . 17
7.7 Time-stamping . 18
7.7.1 Time-stamp issuance. 18
7.7.2 Clock synchronization with UTC . 18
7.8 Physical and environmental security . 19
7.9 Operation security . 19
ETSI
---------------------- Page: 5 ----------------------
SIST EN 319 421 V1.2.1:2023
4 ETSI EN 319 421 V1.2.1 (2023-05)
7.10 Network security . 20
7.11 Incident management . 20
7.12 Collection of evidence . 20
7.13 Business continuity management . 20
7.14 TSA termination and termination plans . 21
7.15 Compliance. 21
8 Additional requirements for qualified electronic time-stamps as per Regulation (EU) No 910/2014 . 21
8.1 TSU public key certificate . 21
8.2 TSA issuing non-qualified and qualified electronic time-stamps as per Regulation (EU) No 910/2014 . 21
Annex A (informative): Potential liability in the provision of time-stamping services . 22
Annex B (informative): Model TSA disclosure statement . 23
B.1 Introduction . 23
B.2 TSA disclosure statement structure . 23
Annex C (informative): Coordinated Universal Time (UTC). 25
Annex D (informative): Long term verification of time-stamps . 26
Annex E (informative): Regulation (EU) No 910/2014 and qualified electronic time-stamp
policy cross-reference . 27
Annex F (informative): Possible implementation architectures - time-stamping service . 28
F.1 Managed time-stamping service . 28
F.2 Selective alternative quality . 28
Annex G (informative): Major changes from ETSI TS 102 023 . 30
Annex H (informative): Conformity Assessment Check list . 31
Annex I (informative): Change History . 32
History . 33
ETSI
---------------------- Page: 6 ----------------------
SIST EN 319 421 V1.2.1:2023
5 ETSI EN 319 421 V1.2.1 (2023-05)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables 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 Web server (https://ipr.etsi.org/).
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™ and LTE™ 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 European Standard (EN) has been produced by ETSI Technical Committee Electronic Signatures and
Infrastructures (ESI).
The present document is derived from the requirements specified in ETSI TS 102 023 [i.8].
National transposition dates
Date of adoption of this EN: 1 May 2023
Date of latest announcement of this EN (doa): 31 August 2023
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 29 February 2024
Date of withdrawal of any conflicting National Standard (dow): 29 February 2024
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.
ETSI
---------------------- Page: 7 ----------------------
SIST EN 319 421 V1.2.1:2023
6 ETSI EN 319 421 V1.2.1 (2023-05)
Introduction
The present document is aiming to meet the general requirements of the international community to provide trust and
confidence in electronic transactions including, amongst others, applicable requirements from Regulation (EU)
No 910/2014 [i.4].
The Regulation includes requirements for Trust Service Providers (TSP) providing services to the public, including
TSPs issuing time-stamps. Additionally, more specific requirements are identified in the Regulation for a specific class
of TSP called a Qualified TSP, with further specific requirements for those Qualified TSPs which issue qualified
time-stamps. The present document is aimed to meet the requirements of the Regulation for both Qualified and
non-Qualified TSPs issuing Qualified and non-Qualified electronic time-stamps respectively.
In order to verify an electronic signature, it can be necessary to prove that the signature from the signer was applied
when the signer's certificate was valid. This is necessary in two circumstances:
1) during the validity period of the signer's certificate, should the signer's certificate be revoked before the end of
its validity, e.g. because the signer's private key has been compromised;
2) after the end of the validity period of the signer's certificate, since CAs are not mandated to process revocation
status information beyond the end of the validity period of the certificates they have issued.
One method consists to use a time-stamp which allows proving that a datum existed before a particular time. This
technique allows proving that the signature was generated before the date contained in the time-stamp. Policy
requirements to cover that case are the primary aim of the present document.
However, these policy requirements allow addressing other needs.
Time-stamping is gaining an increasing interest by the business sector and is becoming an important component of
digital signatures, this is commonly based upon the Time-Stamp protocol from the IETF RFC 3161 [i.2] which is
profiled in ETSI EN 319 422 [5]. Agreed minimum security and quality requirements are necessary in order to ensure
trustworthy validation of long-term digital signatures.
ETSI
---------------------- Page: 8 ----------------------
SIST EN 319 421 V1.2.1:2023
7 ETSI EN 319 421 V1.2.1 (2023-05)
1 Scope
The present document specifies policy and security requirements relating to the operation and management practices of
TSPs issuing time-stamps.
These policy requirements are applicable to TSPs issuing time-stamps. Such time-stamps can be used in support of
digital signatures or for any application requiring to prove that a datum existed before a particular time.
The present document can be used by independent bodies as the basis for confirming that a TSP can be trusted for
issuing time-stamps.
The present document does not specify protocols used to access the TSUs.
NOTE 1: A time-stamping protocol is defined in IETF RFC 3161 [i.2] including optional update in IETF
RFC 5816 [i.3] and profiled in ETSI EN 319 422 [5].
The present document does not specify how the requirements identified can be assessed by an independent party,
including requirements for information to be made available to such independent assessors, or requirements on such
assessors.
NOTE 2: See ETSI EN 319 403-1 [i.9] for guidance on assessment of TSP's processes and services.
NOTE 3: The present document references ETSI EN 319 401 [4] for general policy requirements common to all
classes of TSP's services.
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 at
https://docbox.etsi.org/Reference.
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] Recommendation ITU-R TF.460-6 (2002): "Standard-frequency and time-signal emissions".
[2] ISO/IEC 19790:2012: "Information technology -- Security techniques -- Security requirements for
cryptographic modules".
[3] ISO/IEC 15408 (parts 1 to 3): "Information security, cybersecurity and privacy protection --
Evaluation criteria for IT security ".
[4] ETSI EN 319 401: "Electronic Signatures and Infrastructures (ESI); General Policy Requirements
for Trust Service Providers".
[5] ETSI EN 319 422: "Electronic Signatures and Infrastructures (ESI); Time-stamping protocol and
time-stamp token profiles".
[6] FIPS PUB 140-2 (2002): "Security Requirements for Cryptographic Modules".
[7] FIPS PUB 140-3 (2019): "Security Requirements for Cryptographic Modules".
ETSI
---------------------- Page: 9 ----------------------
SIST EN 319 421 V1.2.1:2023
8 ETSI EN 319 421 V1.2.1 (2023-05)
2.2 Informative 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.
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 not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
[i.1] ETSI EN 319 122-1: "Electronic Signatures and Infrastructures (ESI); CAdES digital signatures;
Part 1: Building blocks and CAdES baseline signatures".
[i.2] IETF RFC 3161 (2001): "Internet X.509 Public Key Infrastructure: Time-Stamp Protocol (TSP)".
[i.3] IETF RFC 5816: "ESSCertIDV2 update to RFC 3161".
[i.4] Regulation (EU) No 910/2014 of the European Parliament and of the Council on electronic
identification and trust services for electronic transactions in the internal market and repealing
Directive 1999/93/EC.
[i.5] Council Directive 93/13/EEC of 5 April 1993 on unfair terms in consumer contracts.
[i.6] BIPM Circular T.
NOTE: Available from the BIPM website https://www.bipm.org/.
[i.7] ETSI TS 119 312: "Electronic Signatures and Infrastructures (ESI); Cryptographic Suites".
[i.8] ETSI TS 102 023: "Electronic Signatures and Infrastructures (ESI); Policy requirements for time-
stamping authorities".
[i.9] ETSI EN 319 403-1: "Electronic Signatures and Infrastructures (ESI); Trust Service Provider
Conformity Assessment; Part 1: Requirements for conformity assessment bodies assessing Trust
Service Providers".
[i.10] ETSI EN 319 411-1: "Electronic Signatures and Infrastructures (ESI); Policy and security
requirements for Trust Service Providers issuing certificates; Part 1: General requirements".
[i.11] ETSI EN 319 411-2: "Electronic Signatures and Infrastructures (ESI); Policy and security
requirements for Trust Service Providers issuing certificates; Part 2: Requirements for trust service
providers issuing EU qualified certificates".
[i.12] EN 419231: "Protection profile for trustworthy systems supporting time stamping", (produced by
CEN).
[i.13] TS 419221-2: "Protection profiles for TSP Cryptographic modules - Part 2: Cryptographic module
for CSP signing operations with backup", (produced by CEN).
[i.14] TS 419221-3: "Protection profiles for TSP Cryptographic modules - Part 3: Cryptographic module
for CSP key generation services", (produced by CEN).
[i.15] TS 419221-4: "Protection profiles for TSP Cryptographic modules - Part 4: Cryptographic module
for CSP signing operations without backup", (produced by CEN).
[i.16] EN 419221-5: "Protection profiles for TSP Cryptographic modules - Part 5: Cryptographic module
for trust services", (produced by CEN).
[i.17] ETSI TS 119 612: "Electronic Signatures and Infrastructures (ESI); Trusted Lists".
ETSI
---------------------- Page: 10 ----------------------
SIST EN 319 421 V1.2.1:2023
9 ETSI EN 319 421 V1.2.1 (2023-05)
3 Definitions of terms, symbols, abbreviations and
notation
3.1 Terms
For the purposes of the present document, the terms given ETSI EN 319 401 [4] and the following apply:
NOTE: Where a definition is copied from a referenced document this is indicated by inclusion of the reference
identifier number at the end of the definition.
Coordinated Universal Time (UTC): time scale based on the second as defined in Recommendation ITU-R
TF.460-6 [1]
NOTE: For most practical purposes UTC is equivalent to mean solar time at the prime meridian (0°). More
specifically, UTC is a compromise between the highly stable atomic time (Temps Atomique International
- TAI) and solar time derived from the irregular Earth rotation (related to the Greenwich Mean Sidereal
Time (GMST) by a conventional relationship) (see annex C for more details).
relying party: recipient of a time-stamp who relies on that time-stamp
subscriber: legal or natural person to whom a time-stamp is issued and who is bound to any subscriber obligations
time-stamp: data in electronic form which binds other electronic data to a particular time establishing evidence that
these data existed at that time
time-stamp policy: named set of rules that indicates the applicability of a time-stamp to a particular community and/or
class of application with common security requirements
NOTE: This is a specific type of trust service policy as defined in ETSI EN 319 401 [4].
Time-Stamping Authority (TSA): TSP providing time-stamping services using one or more time-stamping units
time-stamping service: trust service for issuing time-stamps
Time-Stamping Unit (TSU): set of hardware and software which is managed as a unit and has a single time-stamp
signing key active at a time
trust service: electronic service that enhances trust and confidence in electronic transactions
Trust Service Provider (TSP): entity which provides one or more trust services
TSA Disclosure statement: set of statements about the policies and practices of a TSA that particularly require
emphasis or disclosure to subscribers and relying parties, for example to meet regulatory requirements
TSA practice statement: statement of the practices that a TSA employs in issuing time-stamp
NOTE: This is a specific type of trust service practice statement as defined in ETSI EN 319 401 [4].
TSA system: composition of IT products and components organized to supp
...
Draft ETSI EN 319 421 V1.2.0 (2023-01)
EUROPEAN STANDARD
Electronic Signatures and Infrastructures (ESI);
Policy and Security Requirements for
Trust Service Providers issuing Time-Stamps
---------------------- Page: 1 ----------------------
2 Draft ETSI EN 319 421 V1.2.0 (2023-01)
Reference
REN/ESI-0019421v1.2.1
Keywords
e-commerce, electronic signature, security,
time-stamping, trust services
ETSI
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The information provided in the present deliverable is directed solely to professionals who have the appropriate degree of
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No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and
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The content of the PDF version shall not be modified without the written authorization of ETSI.
The copyright and the foregoing restriction extend to reproduction in all media.
© ETSI 2023.
All rights reserved.
ETSI
---------------------- Page: 2 ----------------------
3 Draft ETSI EN 319 421 V1.2.0 (2023-01)
Contents
Intellectual Property Rights . 5
Foreword . 5
Modal verbs terminology . 5
Introduction . 6
1 Scope . 7
2 References . 7
2.1 Normative references . 7
2.2 Informative references . 8
3 Definitions of terms, symbols, abbreviations and notation . 9
3.1 Terms . 9
3.2 Symbols . 9
3.3 Abbreviations . 10
3.4 Notation . 10
4 General concepts . 10
4.1 General policy requirements concepts . 10
4.2 Time-stamping services . 11
4.3 Time-Stamping Authority (TSA) . 11
4.4 Subscriber . 11
4.5 Time-stamp policy and TSA practice statement . 11
5 Introduction to time-stamp policies and general requirements . 12
5.1 General requirements . 12
5.2 Policy name and identification . 12
5.3 User community and applicability . 12
5.3.1 Best practices time-stamp policy . 12
6 Policies and practices . 12
6.1 Risk assessment . 12
6.2 Trust Service Practice Statement . 13
6.3 Terms and conditions . 13
6.4 Information security policy . 13
6.5 TSA obligations . 13
6.5.1 General . 13
6.5.2 TSA obligations towards subscribers . 13
6.6 Information for relying parties . 14
7 TSA management and operation . 14
7.1 Introduction . 14
7.2 Internal organization. 14
7.3 Personnel security. 14
7.4 Asset management . 15
7.5 Access control . 15
7.6 Cryptographic controls . 15
7.6.1 General . 15
7.6.2 TSU key generation . 15
7.6.3 TSU private key protection . 16
7.6.4 TSU public key certificate . 16
7.6.5 Rekeying TSU's key . 16
7.6.6 Life cycle management of signing cryptographic hardware . 17
7.6.7 End of TSU key life cycle . 17
7.7 Time-stamping . 17
7.7.1 Time-stamp issuance. 17
7.7.2 Clock synchronization with UTC . 18
7.8 Physical and environmental security . 19
7.9 Operation security . 19
ETSI
---------------------- Page: 3 ----------------------
4 Draft ETSI EN 319 421 V1.2.0 (2023-01)
7.10 Network security . 19
7.11 Incident management . 20
7.12 Collection of evidence . 20
7.13 Business continuity management . 20
7.14 TSA termination and termination plans . 20
7.15 Compliance. 21
8 Additional requirements for qualified electronic time-stamps as per Regulation (EU) No 910/2014 . 21
8.1 TSU public key certificate . 21
8.2 TSA issuing non-qualified and qualified electronic time-stamps as per Regulation (EU) No 910/2014 . 21
Annex A (informative): Potential liability in the provision of time-stamping services . 22
Annex B (informative): Model TSA disclosure statement . 23
B.1 Introduction . 23
B.2 TSA disclosure statement structure . 23
Annex C (informative): Coordinated Universal Time (UTC). 25
Annex D (informative): Long term verification of time-stamps . 26
Annex E (informative): Regulation (EU) No 910/2014 and qualified electronic time-stamp
policy cross-reference . 27
Annex F (informative): Possible implementation architectures - time-stamping service . 28
F.1 Managed time-stamping service . 28
F.2 Selective alternative quality . 28
Annex G (informative): Major changes from ETSI TS 102 023 . 30
Annex H (informative): Conformity Assessment Check list . 31
Annex I (informative): Change History . 32
History . 33
ETSI
---------------------- Page: 4 ----------------------
5 Draft ETSI EN 319 421 V1.2.0 (2023-01)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables 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 Web server (https://ipr.etsi.org/).
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™ and LTE™ 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 European Standard (EN) has been produced by ETSI Technical Committee Electronic Signatures and
Infrastructures (ESI), and is now submitted for the combined Public Enquiry and Vote phase of the ETSI standards EN
Approval Procedure.
The present document is derived from the requirements specified in ETSI TS 102 023 [i.8].
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): 6 months after doa
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.
ETSI
---------------------- Page: 5 ----------------------
6 Draft ETSI EN 319 421 V1.2.0 (2023-01)
Introduction
The present document is aiming to meet the general requirements of the international community to provide trust and
confidence in electronic transactions including, amongst others, applicable requirements from Regulation (EU)
No 910/2014 [i.4].
The Regulation includes requirements for Trust Service Providers (TSP) providing services to the public, including
TSPs issuing time-stamps. Additionally, more specific requirements are identified in the Regulation for a specific class
of TSP called a Qualified TSP, with further specific requirements for those Qualified TSPs which issue qualified
time-stamps. The present document is aimed to meet the requirements of the Regulation for both Qualified and
non-Qualified TSPs issuing Qualified and non-Qualified electronic time-stamps respectively.
In order to verify an electronic signature, it can be necessary to prove that the signature from the signer was applied
when the signer's certificate was valid. This is necessary in two circumstances:
1) during the validity period of the signer's certificate, should the signer's certificate be revoked before the end of
its validity, e.g. because the signer's private key has been compromised;
2) after the end of the validity period of the signer's certificate, since CAs are not mandated to process revocation
status information beyond the end of the validity period of the certificates they have issued.
One method consists to use a time-stamp which allows proving that a datum existed before a particular time. This
technique allows proving that the signature was generated before the date contained in the time-stamp. Policy
requirements to cover that case are the primary aim of the present document.
However, these policy requirements allow addressing other needs.
Time-stamping is gaining an increasing interest by the business sector and is becoming an important component of
digital signatures, this is commonly based upon the Time-Stamp protocol from the IETF RFC 3161 [i.2] which is
profiled in ETSI EN 319 422 [5]. Agreed minimum security and quality requirements are necessary in order to ensure
trustworthy validation of long-term digital signatures.
ETSI
---------------------- Page: 6 ----------------------
7 Draft ETSI EN 319 421 V1.2.0 (2023-01)
1 Scope
The present document specifies policy and security requirements relating to the operation and management practices of
TSPs issuing time-stamps.
These policy requirements are applicable to TSPs issuing time-stamps. Such time-stamps can be used in support of
digital signatures or for any application requiring to prove that a datum existed before a particular time.
The present document can be used by independent bodies as the basis for confirming that a TSP can be trusted for
issuing time-stamps.
The present document does not specify protocols used to access the TSUs.
NOTE 1: A time-stamping protocol is defined in IETF RFC 3161 [i.2] including optional update in IETF
RFC 5816 [i.3] and profiled in ETSI EN 319 422 [5].
The present document does not specify how the requirements identified can be assessed by an independent party,
including requirements for information to be made available to such independent assessors, or requirements on such
assessors.
NOTE 2: See ETSI EN 319 403-1 [i.9] for guidance on assessment of TSP's processes and services.
NOTE 3: The present document references ETSI EN 319 401 [4] for general policy requirements common to all
classes of TSP's services.
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 at
https://docbox.etsi.org/Reference.
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] Recommendation ITU-R TF.460-6 (2002): "Standard-frequency and time-signal emissions".
[2] ISO/IEC 19790:2012: "Information technology -- Security techniques -- Security requirements for
cryptographic modules".
[3] ISO/IEC 15408 (parts 1 to 3): "Information security, cybersecurity and privacy protection --
Evaluation criteria for IT security ".
[4] ETSI EN 319 401: "Electronic Signatures and Infrastructures (ESI); General Policy Requirements
for Trust Service Providers".
[5] ETSI EN 319 422: "Electronic Signatures and Infrastructures (ESI); Time-stamping protocol and
time-stamp token profiles".
[6] FIPS PUB 140-2 (2002): "Security Requirements for Cryptographic Modules".
[7] FIPS PUB 140-3 (2019): "Security Requirements for Cryptographic Modules".
ETSI
---------------------- Page: 7 ----------------------
8 Draft ETSI EN 319 421 V1.2.0 (2023-01)
2.2 Informative 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.
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 not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
[i.1] ETSI EN 319 122-1: "Electronic Signatures and Infrastructures (ESI); CAdES digital signatures;
Part 1: Building blocks and CAdES baseline signatures".
[i.2] IETF RFC 3161 (2001): "Internet X.509 Public Key Infrastructure: Time-Stamp Protocol (TSP)".
[i.3] IETF RFC 5816: "ESSCertIDV2 update to RFC 3161".
[i.4] Regulation (EU) No 910/2014 of the European Parliament and of the Council on electronic
identification and trust services for electronic transactions in the internal market and repealing
Directive 1999/93/EC.
[i.5] Council Directive 93/13/EEC of 5 April 1993 on unfair terms in consumer contracts.
[i.6] BIPM Circular T.
NOTE: Available from the BIPM website https://www.bipm.org/.
[i.7] ETSI TS 119 312: "Electronic Signatures and Infrastructures (ESI); Cryptographic Suites".
[i.8] ETSI TS 102 023: "Electronic Signatures and Infrastructures (ESI); Policy requirements for time-
stamping authorities".
[i.9] ETSI EN 319 403-1: "Electronic Signatures and Infrastructures (ESI); Trust Service Provider
Conformity Assessment; Part 1: Requirements for conformity assessment bodies assessing Trust
Service Providers".
[i.10] ETSI EN 319 411-1: "Electronic Signatures and Infrastructures (ESI); Policy and security
requirements for Trust Service Providers issuing certificates; Part 1: General requirements".
[i.11] ETSI EN 319 411-2: "Electronic Signatures and Infrastructures (ESI); Policy and security
requirements for Trust Service Providers issuing certificates; Part 2: Requirements for trust service
providers issuing EU qualified certificates".
[i.12] EN 419231: "Protection profile for trustworthy systems supporting time stamping", (produced by
CEN).
[i.13] TS 419221-2: "Protection profiles for TSP Cryptographic modules - Part 2: Cryptographic module
for CSP signing operations with backup", (produced by CEN).
[i.14] TS 419221-3: "Protection profiles for TSP Cryptographic modules - Part 3: Cryptographic module
for CSP key generation services", (produced by CEN).
[i.15] TS 419221-4: "Protection profiles for TSP Cryptographic modules - Part 4: Cryptographic module
for CSP signing operations without backup", (produced by CEN).
[i.16] EN 419221-5: "Protection profiles for TSP Cryptographic modules - Part 5: Cryptographic module
for trust services", (produced by CEN).
[i.17] ETSI TS 119 612: "Electronic Signatures and Infrastructures (ESI); Trusted Lists".
ETSI
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9 Draft ETSI EN 319 421 V1.2.0 (2023-01)
3 Definitions of terms, symbols, abbreviations and
notation
3.1 Terms
For the purposes of the present document, the terms given ETSI EN 319 401 [4] and the following apply:
NOTE: Where a definition is copied from a referenced document this is indicated by inclusion of the reference
identifier number at the end of the definition.
Coordinated Universal Time (UTC): time scale based on the second as defined in Recommendation
ITU-R TF.460-6 [1]
NOTE: For most practical purposes UTC is equivalent to mean solar time at the prime meridian (0°). More
specifically, UTC is a compromise between the highly stable atomic time (Temps Atomique International
- TAI) and solar time derived from the irregular Earth rotation (related to the Greenwich Mean Sidereal
Time (GMST) by a conventional relationship) (see annex C for more details).
relying party: recipient of a time-stamp who relies on that time-stamp
subscriber: legal or natural person to whom a time-stamp is issued and who is bound to any subscriber obligations
time-stamp: data in electronic form which binds other electronic data to a particular time establishing evidence that
these data existed at that time
time-stamp policy: named set of rules that indicates the applicability of a time-stamp to a particular community and/or
class of application with common security requirements
NOTE: This is a specific type of trust service policy as defined in ETSI EN 319 401 [4].
Time-Stamping Authority (TSA): TSP providing time-stamping services using one or more time-stamping units
time-stamping service: trust service for issuing time-stamps
Time-Stamping Unit (TSU): set of hardware and software which is managed as a unit and has a single time-stamp
signing key active at a time
trust service: electronic service that enhances trust and confidence in electronic transactions
Trust Service Provider (TSP): entity which provides one or more trust services
TSA Disclosure statement: set of statements about the policies and practices of a TSA that particularly require
emphasis or disclosure to subscribers and relying parties, for example to meet regulatory requirements
TSA practice statement: statement of the practices that a TSA employs in issuing time-stamp
NOTE: This is a specific type of trust service practice statement as defined in ETSI EN 319 401 [4].
TSA system: composition of IT products and components organized to support the provision of time-stamping services
UTC(k): time scale realized by the laboratory "k" and kept in close agreement with UTC, with the goal to reach
±100 ns
NOTE: A list of UTC(k) laboratories is given in clause 1 of Circular T [i.6] disseminated by BIPM and available
from the BIPM website (https://www.bipm.org/).
3.2 Symbols
Void.
ETSI
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10 Draft ETSI EN 319 421 V1.2.0 (2023-01)
3.3 Abbreviations
For the purposes of the present document, the abbreviations given in ETSI EN 319 401 [4] and the following apply:
BIPM Bureau International des Poids et Mesures
BTSP Best practices Time-Stamp Policy
CA Certification Authority
IERS International Earth Rotation and Reference System Service
IT Information Technology
TAI International Atomic Time
TSA Time-Stamping Authority
TSP Trust Service Provider
TSU Time-Stamping Unit
UTC Co
...
SLOVENSKI STANDARD
oSIST prEN 319 421 V1.2.0:2023
01-april-2023
Elektronski podpisi in infrastruktura (ESI) - Zahteve politike in varnosti za
ponudnike storitev zaupanja, ki izdajajo časovne žige
Electronic Signatures and Infrastructures (ESI) - Policy and Security Requirements for
Trust Service Providers issuing Time-Stamps
Ta slovenski standard je istoveten z: ETSI EN 319 421 V1.2.0 (2023-01)
ICS:
35.030 Informacijska varnost IT Security
35.040.01 Kodiranje informacij na Information coding in general
splošno
oSIST prEN 319 421 V1.2.0:2023 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 319 421 V1.2.0:2023
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oSIST prEN 319 421 V1.2.0:2023
Draft ETSI EN 319 421 V1.2.0 (2023-01)
EUROPEAN STANDARD
Electronic Signatures and Infrastructures (ESI);
Policy and Security Requirements for
Trust Service Providers issuing Time-Stamps
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oSIST prEN 319 421 V1.2.0:2023
2 Draft ETSI EN 319 421 V1.2.0 (2023-01)
Reference
REN/ESI-0019421v1.2.1
Keywords
e-commerce, electronic signature, security,
time-stamping, trust services
ETSI
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All rights reserved.
ETSI
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oSIST prEN 319 421 V1.2.0:2023
3 Draft ETSI EN 319 421 V1.2.0 (2023-01)
Contents
Intellectual Property Rights . 5
Foreword . 5
Modal verbs terminology . 5
Introduction . 6
1 Scope . 7
2 References . 7
2.1 Normative references . 7
2.2 Informative references . 8
3 Definitions of terms, symbols, abbreviations and notation . 9
3.1 Terms . 9
3.2 Symbols . 9
3.3 Abbreviations . 10
3.4 Notation . 10
4 General concepts . 10
4.1 General policy requirements concepts . 10
4.2 Time-stamping services . 11
4.3 Time-Stamping Authority (TSA) . 11
4.4 Subscriber . 11
4.5 Time-stamp policy and TSA practice statement . 11
5 Introduction to time-stamp policies and general requirements . 12
5.1 General requirements . 12
5.2 Policy name and identification . 12
5.3 User community and applicability . 12
5.3.1 Best practices time-stamp policy . 12
6 Policies and practices . 12
6.1 Risk assessment . 12
6.2 Trust Service Practice Statement . 13
6.3 Terms and conditions . 13
6.4 Information security policy . 13
6.5 TSA obligations . 13
6.5.1 General . 13
6.5.2 TSA obligations towards subscribers . 13
6.6 Information for relying parties . 14
7 TSA management and operation . 14
7.1 Introduction . 14
7.2 Internal organization. 14
7.3 Personnel security. 14
7.4 Asset management . 15
7.5 Access control . 15
7.6 Cryptographic controls . 15
7.6.1 General . 15
7.6.2 TSU key generation . 15
7.6.3 TSU private key protection . 16
7.6.4 TSU public key certificate . 16
7.6.5 Rekeying TSU's key . 16
7.6.6 Life cycle management of signing cryptographic hardware . 17
7.6.7 End of TSU key life cycle . 17
7.7 Time-stamping . 17
7.7.1 Time-stamp issuance. 17
7.7.2 Clock synchronization with UTC . 18
7.8 Physical and environmental security . 19
7.9 Operation security . 19
ETSI
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oSIST prEN 319 421 V1.2.0:2023
4 Draft ETSI EN 319 421 V1.2.0 (2023-01)
7.10 Network security . 19
7.11 Incident management . 20
7.12 Collection of evidence . 20
7.13 Business continuity management . 20
7.14 TSA termination and termination plans . 20
7.15 Compliance. 21
8 Additional requirements for qualified electronic time-stamps as per Regulation (EU) No 910/2014 . 21
8.1 TSU public key certificate . 21
8.2 TSA issuing non-qualified and qualified electronic time-stamps as per Regulation (EU) No 910/2014 . 21
Annex A (informative): Potential liability in the provision of time-stamping services . 22
Annex B (informative): Model TSA disclosure statement . 23
B.1 Introduction . 23
B.2 TSA disclosure statement structure . 23
Annex C (informative): Coordinated Universal Time (UTC). 25
Annex D (informative): Long term verification of time-stamps . 26
Annex E (informative): Regulation (EU) No 910/2014 and qualified electronic time-stamp
policy cross-reference . 27
Annex F (informative): Possible implementation architectures - time-stamping service . 28
F.1 Managed time-stamping service . 28
F.2 Selective alternative quality . 28
Annex G (informative): Major changes from ETSI TS 102 023 . 30
Annex H (informative): Conformity Assessment Check list . 31
Annex I (informative): Change History . 32
History . 33
ETSI
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5 Draft ETSI EN 319 421 V1.2.0 (2023-01)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables 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 Web server (https://ipr.etsi.org/).
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™ and LTE™ 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 European Standard (EN) has been produced by ETSI Technical Committee Electronic Signatures and
Infrastructures (ESI), and is now submitted for the combined Public Enquiry and Vote phase of the ETSI standards EN
Approval Procedure.
The present document is derived from the requirements specified in ETSI TS 102 023 [i.8].
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): 6 months after doa
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.
ETSI
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6 Draft ETSI EN 319 421 V1.2.0 (2023-01)
Introduction
The present document is aiming to meet the general requirements of the international community to provide trust and
confidence in electronic transactions including, amongst others, applicable requirements from Regulation (EU)
No 910/2014 [i.4].
The Regulation includes requirements for Trust Service Providers (TSP) providing services to the public, including
TSPs issuing time-stamps. Additionally, more specific requirements are identified in the Regulation for a specific class
of TSP called a Qualified TSP, with further specific requirements for those Qualified TSPs which issue qualified
time-stamps. The present document is aimed to meet the requirements of the Regulation for both Qualified and
non-Qualified TSPs issuing Qualified and non-Qualified electronic time-stamps respectively.
In order to verify an electronic signature, it can be necessary to prove that the signature from the signer was applied
when the signer's certificate was valid. This is necessary in two circumstances:
1) during the validity period of the signer's certificate, should the signer's certificate be revoked before the end of
its validity, e.g. because the signer's private key has been compromised;
2) after the end of the validity period of the signer's certificate, since CAs are not mandated to process revocation
status information beyond the end of the validity period of the certificates they have issued.
One method consists to use a time-stamp which allows proving that a datum existed before a particular time. This
technique allows proving that the signature was generated before the date contained in the time-stamp. Policy
requirements to cover that case are the primary aim of the present document.
However, these policy requirements allow addressing other needs.
Time-stamping is gaining an increasing interest by the business sector and is becoming an important component of
digital signatures, this is commonly based upon the Time-Stamp protocol from the IETF RFC 3161 [i.2] which is
profiled in ETSI EN 319 422 [5]. Agreed minimum security and quality requirements are necessary in order to ensure
trustworthy validation of long-term digital signatures.
ETSI
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oSIST prEN 319 421 V1.2.0:2023
7 Draft ETSI EN 319 421 V1.2.0 (2023-01)
1 Scope
The present document specifies policy and security requirements relating to the operation and management practices of
TSPs issuing time-stamps.
These policy requirements are applicable to TSPs issuing time-stamps. Such time-stamps can be used in support of
digital signatures or for any application requiring to prove that a datum existed before a particular time.
The present document can be used by independent bodies as the basis for confirming that a TSP can be trusted for
issuing time-stamps.
The present document does not specify protocols used to access the TSUs.
NOTE 1: A time-stamping protocol is defined in IETF RFC 3161 [i.2] including optional update in IETF
RFC 5816 [i.3] and profiled in ETSI EN 319 422 [5].
The present document does not specify how the requirements identified can be assessed by an independent party,
including requirements for information to be made available to such independent assessors, or requirements on such
assessors.
NOTE 2: See ETSI EN 319 403-1 [i.9] for guidance on assessment of TSP's processes and services.
NOTE 3: The present document references ETSI EN 319 401 [4] for general policy requirements common to all
classes of TSP's services.
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 at
https://docbox.etsi.org/Reference.
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] Recommendation ITU-R TF.460-6 (2002): "Standard-frequency and time-signal emissions".
[2] ISO/IEC 19790:2012: "Information technology -- Security techniques -- Security requirements for
cryptographic modules".
[3] ISO/IEC 15408 (parts 1 to 3): "Information security, cybersecurity and privacy protection --
Evaluation criteria for IT security ".
[4] ETSI EN 319 401: "Electronic Signatures and Infrastructures (ESI); General Policy Requirements
for Trust Service Providers".
[5] ETSI EN 319 422: "Electronic Signatures and Infrastructures (ESI); Time-stamping protocol and
time-stamp token profiles".
[6] FIPS PUB 140-2 (2002): "Security Requirements for Cryptographic Modules".
[7] FIPS PUB 140-3 (2019): "Security Requirements for Cryptographic Modules".
ETSI
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oSIST prEN 319 421 V1.2.0:2023
8 Draft ETSI EN 319 421 V1.2.0 (2023-01)
2.2 Informative 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.
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 not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
[i.1] ETSI EN 319 122-1: "Electronic Signatures and Infrastructures (ESI); CAdES digital signatures;
Part 1: Building blocks and CAdES baseline signatures".
[i.2] IETF RFC 3161 (2001): "Internet X.509 Public Key Infrastructure: Time-Stamp Protocol (TSP)".
[i.3] IETF RFC 5816: "ESSCertIDV2 update to RFC 3161".
[i.4] Regulation (EU) No 910/2014 of the European Parliament and of the Council on electronic
identification and trust services for electronic transactions in the internal market and repealing
Directive 1999/93/EC.
[i.5] Council Directive 93/13/EEC of 5 April 1993 on unfair terms in consumer contracts.
[i.6] BIPM Circular T.
NOTE: Available from the BIPM website https://www.bipm.org/.
[i.7] ETSI TS 119 312: "Electronic Signatures and Infrastructures (ESI); Cryptographic Suites".
[i.8] ETSI TS 102 023: "Electronic Signatures and Infrastructures (ESI); Policy requirements for time-
stamping authorities".
[i.9] ETSI EN 319 403-1: "Electronic Signatures and Infrastructures (ESI); Trust Service Provider
Conformity Assessment; Part 1: Requirements for conformity assessment bodies assessing Trust
Service Providers".
[i.10] ETSI EN 319 411-1: "Electronic Signatures and Infrastructures (ESI); Policy and security
requirements for Trust Service Providers issuing certificates; Part 1: General requirements".
[i.11] ETSI EN 319 411-2: "Electronic Signatures and Infrastructures (ESI); Policy and security
requirements for Trust Service Providers issuing certificates; Part 2: Requirements for trust service
providers issuing EU qualified certificates".
[i.12] EN 419231: "Protection profile for trustworthy systems supporting time stamping", (produced by
CEN).
[i.13] TS 419221-2: "Protection profiles for TSP Cryptographic modules - Part 2: Cryptographic module
for CSP signing operations with backup", (produced by CEN).
[i.14] TS 419221-3: "Protection profiles for TSP Cryptographic modules - Part 3: Cryptographic module
for CSP key generation services", (produced by CEN).
[i.15] TS 419221-4: "Protection profiles for TSP Cryptographic modules - Part 4: Cryptographic module
for CSP signing operations without backup", (produced by CEN).
[i.16] EN 419221-5: "Protection profiles for TSP Cryptographic modules - Part 5: Cryptographic module
for trust services", (produced by CEN).
[i.17] ETSI TS 119 612: "Electronic Signatures and Infrastructures (ESI); Trusted Lists".
ETSI
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oSIST prEN 319 421 V1.2.0:2023
9 Draft ETSI EN 319 421 V1.2.0 (2023-01)
3 Definitions of terms, symbols, abbreviations and
notation
3.1 Terms
For the purposes of the present document, the terms given ETSI EN 319 401 [4] and the following apply:
NOTE: Where a definition is copied from a referenced document this is indicated by inclusion of the reference
identifier number at the end of the definition.
Coordinated Universal Time (UTC): time scale based on the second as defined in Recommendation
ITU-R TF.460-6 [1]
NOTE: For most practical purposes UTC is equivalent to mean solar time at the prime meridian (0°). More
specifically, UTC is a compromise between the highly stable atomic time (Temps Atomique International
- TAI) and solar time derived from the irregular Earth rotation (related to the Greenwich Mean Sidereal
Time (GMST) by a conventional relationship) (see annex C for more details).
relying party: recipient of a time-stamp who relies on that time-stamp
subscriber: legal or natural person to whom a time-stamp is issued and who is bound to any subscriber obligations
time-stamp: data in electronic form which binds other electronic data to a particular time establishing evidence that
these data existed at that time
time-stamp policy: named set of rules that indicates the applicability of a time-stamp to a particular community and/or
class of application with common security requirements
NOTE: This is a specific type of trust service policy as defined in ETSI EN 319 401 [4].
Time-Stamping Authority (TSA): TSP providing time-stamping services using one or more time-stamping units
time-stamping service: trust service for issuing time-stamps
Time-Stamping Unit (TSU): set of hardware and software which is managed as a unit and has a single time-stamp
signing key active at a time
trust service: electronic service that enhances trust and confidence in electronic transactions
Trust Service Provider (TSP): entity which provides one or more trust services
TSA Disclosure statement: set of statements about the policies and practices of a TSA that particularly require
emphasis or disclosure to subscribers and relying parties, for example to meet regulatory requirements
TSA practice statement: statement of the practices that a TSA employs in
...
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