ISO 14533-2:2021

INTERNATIONAL ISO
STANDARD 14533-2
Second edition
2021-08
Processes, data elements and
documents in commerce, industry
and administration — Long term
signature —
Part 2:
Profiles for XML Advanced Electronic
Signatures (XAdES)
Reference number
©
ISO 2021
© ISO 2021
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ii © ISO 2021 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Long term signature profiles . 2
4.1 Defined profile . 2
4.1.1 General. 2
4.1.2 Supplier’s declaration of conformance . 3
4.1.3 XML namespaces . 3
4.1.4 Operation of long term signature . 3
4.2 Representation of the required level . 4
4.3 Standard for setting the required level . 4
4.4 Action to take when an optional element is not implemented . 5
4.5 XAdES-T profile . 5
4.5.1 General. 5
4.5.2 Signature element . 5
4.5.3 Object element, SignedSignatureProperties element . 6
4.5.4 Object element, UnsignedSignatureProperties element . 7
4.6 XAdES-X-Long form . 7
4.6.1 General. 7
4.6.2 Structure of the XAdES-X-Long form . 7
4.6.3 Additional UnsignedSignatureProperties element . 7
4.7 XAdES-A profile . 8
4.7.1 General. 8
4.7.2 Structure of the XAdES-A profile . 9
4.7.3 Additional UnsignedSignatureProperties element for XAdES-A profile . 9
4.8 Timestamp validation data . 9
Annex A (normative) Supplier's declaration of conformity and its attachment .11
Annex B (normative) Structure of timestamp token .16
Annex C (informative) Differences of required level between European EN and ISO specification 18
Bibliography .19
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
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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
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on the ISO list of patent declarations received (see www .iso .org/ patents).
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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 14533-2:2012), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— in first edition (ISO 14533-2:2012), XAdES was an abbreviated term for ‘XML Advanced Electronic
Signature’; in this edition, XAdES becomes a proper noun and is used as ‘XAdES digital signature’;
— this edition supports XML namespace XAdES 1.4.1 elements;
— XAdES-A profile level is divided and explained as XAdES-X-Long form level;
— this edition describes the comparison with European EN in Annex C, "Differences of required level
between European EN and ISO specification".
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 © ISO 2021 – All rights reserved

Introduction
The purpose of this document is to ensure the interoperability of implementations with respect
to long term signatures that make digital signatures verifiable for a long term. Long term signature
specifications referenced by each implementation cover XAdES digital signatures developed by the
European Telecommunications Standards Institute (ETSI).
ETSI EN 319 132 specifies data structures and core elements for XAdES digital signature. This
document profiles ETSI EN 319 132 specification for international long term signature interoperability.
ETSI EN 319 132 specification provides definitions of data structures, data elements and their usage in
detail. To maintain consistency with ETSI EN 319 132 specification, this document avoids quoting and
redefining those components defined in ETSI EN 319 132 specification.
In the first edition (ISO 14533-2:2012), XAdES was an acronym for ‘XML Advanced Electronic Signature’.
In this second edition (ISO 14533-2:2021), XAdES is used as a proper noun and ‘XML Advanced
Electronic Signature’ is changed to ‘XAdES Digital Signature’ in line with the definition change of ETSI
from TS to EN; but it is still used in the document title.
INTERNATIONAL STANDARD ISO 14533-2:2021(E)
Processes, data elements and documents in commerce,
industry and administration — Long term signature —
Part 2:
Profiles for XML Advanced Electronic Signatures (XAdES)
1 Scope
This document specifies the elements, among those defined in XAdES digital signatures, 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.
NOTE XAdES digital signatures is the widely-used extended specification of “XML-Signature Syntax and
Processing”.
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)
1)
ETSI EN 319 132-2 , XAdES digital signatures Part 2: Extended XAdES signatures v1.1.1, (April 2016)
2)
XML Signature Syntax and Processing , W3C Recommendation, 11 April 2013
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 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 http:// www .electropedia .org/
3.1
long term signature
signature that is made verifiable and has 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
1) Available from https:// www .etsi .org/ standards -search.
2) Available from https:// www .w3 .org/ TR/ xmldsig -core/ .
3.2
profile
rule used to ensure interoperability, related to the optional elements of referenced specifications, the
range of values, etc.
3.3
XML signature
XmlDsig
signature syntax and processing for a given message
Note 1 to entry: XML signature shall be as defined in XML Signature Syntax and Processing, W3C Recommendation
11 April 2013.
3.4
XAdES digital signature
XAdES
XML based digital signature defined in ETSI EN 319 132-2 for which the signer can be identified and
any illegal data alteration detected
Note 1 to entry: Digital signatures specified in ETSI documents aim at supporting electronic signatures and
electronic seals.
3.5
XAdES with time
XAdES-T
generic term for the incorporation of all the XAdES digital signature (3.4) defined in ETSI EN 319 132-2
with information to ascertain SigningTime, and intermediate form for long term signature (3.1) profile
(3.2)
3.6
XAdES with validation data
XAdES-X-Long
generic term for the incorporation of all the material required for validating the signature, and
intermediate form for long term signature (3.1) profile (3.2)
3.7
archival XAdES
XAdES-A
generic term for the incorporation of electronic timestamps that allow validation of the digital signature
long time af
...