ISO 14533-3:2017

INTERNATIONAL ISO
STANDARD 14533-3
First edition
2017-09
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)
Processus, éléments d'informations et documents dans le commerce,
l'industrie et l'administration — Profils de signature à long terme —
Partie 3: Profils de signature à long terme pour les signatures
électroniques avancées PDF (PAdES)
Reference number
©
ISO 2017
© ISO 2017, Published in Switzerland
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ii © ISO 2017 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2  Normative references . 1
3  Terms and definitions . 1
4 Abbreviated terms and symbols . 1
5 Requirements . 2
6  Long-term signature profiles . 2
6.1 Definition of PAdES profile and positioning . 2
6.2 Representation of the required level . 3
6.3 Standard for setting the required level . 3
6.4 PAdES-T profile . 4
6.4.1 General. 4
6.4.2 PAdES using CAdES signatures profile . 5
6.4.3 Timestamp of PAdES-T profile . 8
6.5 PAdES-A profile . 8
6.5.1 General. 8
6.5.2 Structure of the PAdES-A profile . 8
6.5.3 Document Security Store Dictionary . 9
6.5.4 Signature VRI Dictionary . 9
6.5.5 Document timestamp . 9
6.5.6 Updating PAdES-A .10
6.5.7 Validation Data for Signature and Timestamp .10
6.6 Multiple signatures.10
6.6.1 General.10
6.6.2 Timestamp for multiple signatures .11
Annex A (normative) 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
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).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on 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 the following
URL: 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.
A list of all parts in the ISO 14533 series can be found on the ISO website.
iv © ISO 2017 – All rights reserved

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 PDF Advanced Electronic Signatures (PAdES)
developed by the European Telecommunications Standards Institute (ETSI).
INTERNATIONAL STANDARD ISO 14533-3:2017(E)
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)
1 Scope
This document 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.
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 14533-1, Processes, data elements and documents in commerce, industry and administration — Long term
signature profiles — Part 1: Long term signature profiles for CMS Advanced Electronic Signatures (CAdES)
ISO 32000-2, Document management — Portable document format — Part 2: PDF 2.0
3  Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 14533-1 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at http://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
3.1
advanced electronic signature
electronic signature which is uniquely linked to the signatory, is capable of identifying the signatory, is
created using electronic signature creation data that the signatory can, with high level of confidence,
use under his sole control, and is linked to the data signed therewith in such a way that any subsequent
change in the data is detectable
4 Abbreviated terms and symbols
The following symbols are used for the “required level”:
— C: Conditional
— M: Mandatory
— O: Optional
— P: Prohibited (creation or modification)
5 Requirements
5.1 The generation or validation of PAdES-T data conforms to this document, provided that the
following requirements are met:
a) all processing of elements whose required level is “Mandatory” in the PAdES-T profile as specified
in this document, shall be included;
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 The generation or validation of PAdES-A data conforms to this document provided that the
following requirements are met:
a) all processing of elements whose required level is “Mandatory” in the PAdES-A profile as specified
in this document, shall be included;
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 The generation or validation of PAdES-DT and PAdES-DTA data conforms to this document,
provided that the requirements of Figures B.1 and B.2 respectively are met. See Annex B.
5.4 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 A) containing a description of implementation status (and the specifications for any elements
“Conditional”).
NOTE 1 See ISO/IEC 17050-1:2004.
NOTE 2 Figure 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:
— signing time shall be identifiable,
— any illegal alterations of information pertaining to signatures, including the subject of information
and validation data, shall be detectable, and
— interoperability shall be ensured.
To meet these requirements, this document defines the following two profiles with respect to PAdES:
a) PAdES-T profile: a profile pertaining to the generation and validation of the signature with a
timestamp for signature. The timestamp is stored in a signature timestamp Attribute of the
signature, or in any subsequent object containing the timestamp, covering the signature. The
subsequent object is a Document timestamp or a signature with the signature timestamp Attribute.
2 © ISO 2017 – All rights reserved

b) PAdES-A profile: a profile pertaining to the generation
...