ISO/FDIS 14533-3

Processes, data elements and documents in commerce, industry and administration — Long-term signature — Part 3: Profiles for PDF Advanced Electronic Signatures (PAdES)

ISO 14533-3:2017 specifies the elements, among those defined in PDF Advanced Electronic Signatures (PAdES), that enable verification of a digital signature over a long period of time. It does not give new technical specifications about the digital signature itself, nor new restrictions of usage of the technical specifications about the digital signatures which already exist.

Processus, éléments d'informations et documents dans le commerce, l'industrie et l'administration — Signature à long terme — Partie 3: Profils pour les signatures électroniques avancées des PDF (PAdES)

General Information

• Status: Not Published
• ICS: 35.240.63 - IT applications in trade
• Technical Committee: ISO/TC 154 - Processes, data elements and documents in commerce, industry and administration
• Drafting Committee: ISO/TC 154/WG 6 - Trusted eCommunications
• Current Stage: 5020 - FDIS ballot initiated: 2 months. Proof sent to secretariat
• Start Date: 28-Jul-2025
• Completion Date: 28-Jul-2025

Relations

• Revises: ISO 14533-3:2017 - Processes, data elements and documents in commerce, industry and administration — Long term signature profiles — Part 3: Long term signature profiles for PDF Advanced Electronic Signatures (PAdES)
• Effective Date: 04-Nov-2023

Standards Content (Sample)

FINAL DRAFT
International
Standard
ISO/TC 154
Processes, data elements and
Secretariat: SAC
documents in commerce, industry
Voting begins on:
and administration — Long-term
2025-07-28
signature —
Voting terminates on:
2025-09-22
Part 3:
Profiles for PDF Advanced
Electronic Signatures (PAdES)
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
FINAL DRAFT
International
Standard
ISO/TC 154
Processes, data elements and
Secretariat: SAC
documents in commerce, industry
Voting begins on:
and administration — Long-term
signature —
Voting terminates on:
Part 3:
Profiles for PDF Advanced
Electronic Signatures (PAdES)
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
© ISO 2025
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland Reference number
ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Abbreviated terms . 2
5 Requirements . 3
5.1 Conformity to PAdES-T .3
5.2 Conformity to PAdES-A .3
5.3 Conformity to PAdES-DT/DTA .3
5.4 Declaration of conformity .3
6 Long-term signature profiles . 3
6.1 Definition of PAdES profile and positioning .3
6.2 Representation of the required level .4
6.3 Standard for setting the required level .4
6.4 PAdES-T profile .5
6.4.1 General .5
6.4.2 PAdES using CAdES signatures profile .6
6.4.3 Timestamp of PAdES-T profile .9
6.5 PAdES-A profile .9
6.5.1 General .9
6.5.2 Structure of the PAdES-A profile .9
6.5.3 Document security store dictionary .10
6.5.4 Signature VRI dictionary .10
6.5.5 Document timestamp . .10
6.5.6 Updating PAdES-A .11
6.5.7 Validation data for signature and timestamp .11
6.6 Multiple signatures .11
6.6.1 General .11
6.6.2 Timestamp for multiple signatures . 12
Annex A (informative) Supplier's declaration of conformity and its attachment .13
Annex B (normative) The profile for using only timestamp .18
Annex C (normative) Structure of timestamp token .20
Annex D (informative) Applying PAdES using CMS signatures .22
Annex E (informative) Examples of multiple signatures .23
Bibliography .26

iii
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 154, Processes, data elements and documents in
commerce, industry and administration.
This second edition cancels and replaces the first edition (ISO 14533-3:2017), which has been technically
revised.
The main changes are as follows:
— terms and definitions have been added in the Clause 3 for clarity;
— the description and the title of tables have been changed in 6.4.2 for clarity.
A list of all parts in the ISO 14533 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

iv
Introduction
The purpose of this document is to ensure the interoperability of implementations with respect to long-term
signatures that make electronic signatures verifiable in the long term. Long-term signature specifications
referenced by each implementation cover CAdES signatures as used in PDF described in ISO 32000-2
(PDF2.0).
v
FINAL DRAFT International Standard ISO/FDIS 14533-3:2025(en)
Processes, data elements and documents in commerce,
industry and administration — Long-term signature —
Part 3:
Profiles for PDF Advanced Electronic Signatures (PAdES)
1 Scope
This document specifies the elements, among those defined in PDF digital signatures (PAdES), that enable
verification of a digital signature over a long period of time.
It does not give new technical specifications about the digital signature itself, nor new restrictions of usage
of the technical specifications about the digital signatures which already exist.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 32000-2, Document management — Portable document format — Part 2: PDF 2.0
3 Terms and definitions
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
long-term signature
signature that is made verifiable having the ability to maintain its validity status and to get a proof of
existence of the associated signed data for a long term by implementing measures to enable the detection
of illegal alterations of signature information, including the identification of signing time, the subject of said
signature, and validation data
[SOURCE: ISO 14533-1:2022, 3.1]
3.2
profile
rule used to ensure interoperability, related to the optional elements of referenced specifications, the range
of
...

Reference number of document: ISO/TC 154 N 1582
Date: 2025-05-10
Reference number of project: ISO/FDIS 14533-3
Second edition
Committee identification: ISO/TC 154
ISO/TC 154
Secretariat: SAC
Date: 2025-07-14
Processes, data elements and documents in commerce, industry and
administration — — Long-term signature — —
Part 3:
Profiles for PDF Advanced Electronic Signatures (PAdES)
FDIS stage
ISO/DISFDIS 14533-3:2025(en)
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication
may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying,
or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO
at the address below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
EmailE-mail: [e-mail]
Website: www.iso.org
Published in Switzerland
© ISO #### 2025 – All rights reserved
ii
Contents
Foreword . iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Abbreviated terms . 3
5 Requirements . 3
5.1 Conformity to PAdES-T . 3
5.2 Conformity to PAdES-A . 3
5.3 Conformity to PAdES-DT/DTA . 3
5.4 Declaration of conformity . 3
6 Long-term signature profiles . 3
6.1 Definition of PAdES profile and positioning . 3
6.2 Representation of the required level . 5
6.3 Standard for setting the required level . 5
6.4 PAdES-T profile . 6
6.5 PAdES-A profile . 11
6.6 Multiple signatures . 14
Annex A (informative) Supplier's declaration of conformity and its attachment . 17
Annex B (normative) The profile for using only timestamp . 22
Annex C (normative) Structure of timestamp token . 24
Annex D (informative) Applying PAdES using CMS signatures . 27
Annex E (informative) Examples of multiple signatures . 28
Bibliography . 34

iii
ISO/DISFDIS 14533-3:2025(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types of
ISO documents should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent rights
in respect thereof. As of the date of publication of this document, ISO had not received notice of (a) patent(s)
which may be required to implement this document. However, implementers are cautioned that this may not
represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 154, Processes, data elements and documents in
commerce, industry and administration.
This second edition cancels and replaces the first edition (ISO 14533-3:2017), which has been technically
revised.
The main changes are as follows:
— — terms and definitions have been added in the Clause 3Clause 3 for clarity;
— — the description and the title of tables have been changed in 6.4.26.4.2 for clarity.
A list of all parts in the ISO 14533 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
© ISO #### 2025 – All rights reserved
iv
Introduction
The purpose of this document is to ensure the interoperability of implementations with respect to long-term
signatures that make electronic signatures verifiable in the long term. Long-term signature specifications
referenced by each implementation cover CAdES signatures as used in PDF described in ISO 32000-2
(PDF2.0).
v
Processes, data elements and documents in commerce, industry and
administration — Long-term signature —
—
Part 3:
Profiles for PDF Advanced Electronic Signatures (PAdES)
1 Scope
This document specifies the elements, among those defined in PDF digital signatures (PAdES), that enable
verification of a digital signature over a long period of time.
It does not give new technical specifications about the digital signature itself, nor new restrictions of usage of
the technical specifications about the digital signatures which already exist.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 32000--2, Document management — Portable document format — Part 2: PDF 2.0
3 Terms and definitions
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— — ISO Online browsing platform: available at https://www.iso.org/obp
— — IEC Electropedia: available at https://www.electropedia.org/
3.1 3.1
long-term signature
signature that is made verifiable having the ability to maintain its validity status and to get a proof of existence
of the associated signed data for a long term by implementing measures to enable the detection of illegal
alterations of signature information, including the identification of signing time, the subject of said signature,
and validation data
[SOURCE: ISO 14533-1:2022, 3.1]
3.2 3.2
profile
rule used to ensure interoperability, related to the optional elements of referenced specifications, the range of
values, etc.
3.3 3.3
required level
level of requirement for implementing each element constituting a profile (3.2(3.2))
ISO/DISFDIS 14533-3:2025(en)
3.4 3.4
trust anchor
) or public key used by the validator to
origin of trust provided in the form of a public key certificate (3.7(3.7)
validate an electronic signature, and generally a public key certificate issued by a trusted root certification
authority (3.6(3.6))
[SOURCE: ISO 14533-1:2022, 3.18]
3.5 3.5
trusted third party
TTP
security authority or its agent entrusted by another entity in connection with activities related to security
[SOURCE: ISO 14533-1:2022, 3.19]
3.6 3.6
certification authority
CA
centre that is entrusted with the development and assignment of public key certificates (3.7(3.7))
Note 1 to entry: Certification authorities can, at their discretion, develop and assign keys to entities.
3.7 3.7
certificate
information on the publicly disclosed key as a part of an asymmetric key pair for an entity, signed by a
certification authority to prevent forgery
3.8 3.8
PAdES
PAdES digital signature
CAdES signature as used in PDF for which the signer can be identified and any illegal data alteration detected
Note 1 to entry: PDF shall be as defined in ISO 32000-2.
3.9 3.9
PAdES-T
PAdES with time
CAdES signature as used in PDF with information to ascertain signing text of the definition
EXAMPLE Signature timestamp, document timestamp.
Note 1 to entry: PDF shall be as defined in ISO 32000-2.
3.10 3.10
PAdES-A
archival PAdES
CAdES signature as used in PDF with information that enables the detection of any illegal alterations of
information pertaining to the signature, including the subject of the signature and validation data
Note 1 to entry: PDF shall be as defined in ISO 32000-2.
© ISO #### 2025 – All rights reserved
4 Abbreviated terms
EOF End Of File
VRI Validation Related Information
EOF end of file
VRI validation-related information
5 Requirements
5.1 Conformity to PAdES-T
The generation or validation of PAdES-T data conforms to this document, provided that the following
requirements are met:
a) a) all processing of elements whose required level is “Mandatory” in the PAdES-T profile as
specified in this document, shall be included;
b) b) detailed specifications pertaining to the processing of any element whose required level is
“Conditional” in the PAdES-T profile, as specified in this document, shall be provided.
5.2 Conformity to PAdES-A
The generation or validation of PAdES-A data conforms to this document provided that the following
requirements are met:
a) a) all processing of elements whose required level is “Mandatory” in the PAdES-A profile as
specified in this document, shall be included;
b) b) detailed specifications pertaining to the processing of any element whose required level is
“Conditional” in the PAdES-A profile as specified in this document, shall be provided.
5.3 Conformity to PAdES-DT/DTA
The generation or validation of PAdES-DT and PAdES-DTA data conforms to this document, provided that the
requirements of Figures B.1Figures B.1 and B.2B.2 respectively are met. The profile shall be in accordance
with Annex BAnnex B.
5.4 Declaration of conformity
If first-party conformity assessment is used, the implementer shall make a declaration of conformity to this
document by disclosing the supplier's declaration of compliance and its attachment (see Annex AAnnex A))
containing a description of implementation status (and the specifications for any elements “Conditional”).
NOTE 1 See ISO/IEC 17050--1.
NOTE 2 Figure 1Figure 1 shows the positioning of the generation and validation of PAdES-T data and PAdES-A data.
6 Long-term signature profiles
6.1 Definition of PAdES profile and positioning
In order to make electronic signatures verifiable in the long term:
ISO/DISFDIS 14533-3:2025(en)
— — signing time shall be identifiable;
— — any illegal alterations of information pertaining to signatures, including the subject of information and
validation data, shall be detectable;
— — interoperability shall be ensured.
To meet these requirements, this document defines the following two profiles with respect to PAdES.
a) a) PAdES-T profile: a profile pertaining to the generation and validation of the signature with a
timestamp for signature. The ti
...