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ISO/IEC 18014-1:2008

(Main)

Information technology — Security techniques — Time-stamping services — Part 1: Framework

Information technology — Security techniques — Time-stamping services — Part 1: Framework

ISO/IEC 18014 specifies time-stamping techniques. It consists of three parts, which include the general notion, models for a time-stamping service, data structures, and protocols. ISO/IEC 18014-1:2008 describes a framework and defines the basic notion, the data structures, and protocols which are used for any time-stamping technique. ISO/IEC 18014-1:2008: identifies the objective of a time-stamping authority; describes a general model on which time-stamping services are based; describes a process of generating and verifying time-stamp; defines the data structures of time-stamp token; defines the basic protocols of time-stamping; specifies the protocols between the involved entities.

Technologies de l'information — Techniques de sécurité — Services d'estampillage de temps — Partie 1: Cadre général

General Information

Status
Published
Publication Date
25-Aug-2008
ICS
35.030 - IT Security
35.040 - Information coding
Technical Committee
ISO/IEC JTC 1/SC 27 - Information security, cybersecurity and privacy protection
Drafting Committee
ISO/IEC JTC 1/SC 27/WG 2 - Cryptography and security mechanisms
Current Stage
9020 - International Standard under periodical review
Start Date
15-Jul-2025
Completion Date
15-Jul-2025
Ref Project

Relations

Amended By
ISO/IEC 18014-1:2008/Amd 1:2025 - Information technology — Security techniques — Time-stamping services — Part 1: Framework — Amendment 1
Effective Date
29-Oct-2022
Revises
ISO/IEC 18014-1:2002 - Information technology — Security techniques — Time-stamping services — Part 1: Framework
Effective Date
15-Apr-2008

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ISO/IEC 18014-1:2008 - Information technology -- Security techniques -- Time-stamping services
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INTERNATIONAL ISO/IEC
STANDARD 18014-1
Second edition
2008-09-01
Information technology — Security
techniques — Time-stamping services —
Part 1:
Framework
Technologies de l'information — Techniques de sécurité — Services
d'estampillage de temps —
Partie 1: Cadre général
Reference number
©
ISO/IEC 2008
PDF disclaimer
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©  ISO/IEC 2008
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
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Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
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Web www.iso.org
Published in Switzerland
ii © ISO/IEC 2008 – All rights reserved

Contents Page
Foreword. iv
Introduction . v
1 Scope.1
2 Normative references.1
3 Terms and definitions .1
4 Symbols and abbreviated terms .4
5 General.4
5.1 Background and Summary .4
5.2 Services involved in Time-stamping.5
5.3 Entities of the Time-Stamping Process.5
5.4 Use of Time-Stamps .5
5.5 Generation of a Time-Stamp Token .6
5.6 Verification of a Time-Stamp Token.6
5.7 Time-Stamp renewal.6
6 Communications between entities involved.7
6.1 Time-Stamp Request Transaction.7
6.2 Time-Stamp Verification Transaction.8
7 Message Formats.8
7.1 Time-stamp request.9
7.2 Time-stamp response.10
7.3 Time-stamp verification.12
7.4 Extension fields .12
7.4.1 ExtHash extension.12
7.4.2 ExtMethod extension.13
7.4.3 ExtRenewal extension.13
Annex A (normative) ASN.1 Module for time-stamping .14
Annex B (normative) Excerpt of the Cryptographic Message Syntax .20
B.1 Introduction.20
B.2 General Overview.20
B.3 General Syntax.20
B.4 Data Content Type .21
B.5 Signed-data Content Type .21
B.5.1 SignedData Type.22
B.5.2 EncapsulatedContentInfo Type.23
B.5.3 SignerInfo Type.23
B.5.4 Message Digest Calculation Process .25
B.5.5 Signature Generation Process .25
B.5.6 Signature Verification Process.25
B.6 Useful Attributes.26
B.6.1 Content Type.26
B.6.2 Message Digest.26
B.6.3 Countersignature.27
Bibliography .28

© ISO/IEC 2008 – All rights reserved iii

Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are members of
ISO or IEC participate in the development of International Standards through technical committees
established by the respective organization to deal with particular fields of technical activity. ISO and IEC
technical committees collaborate in fields of mutual interest. Other international organizations, governmental
and non-governmental, in liaison with ISO and IEC, also take part in the work. In the field of information
technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of the joint technical committee is to prepare International Standards. Draft International
Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as
an International Standard requires approval by at least 75 % of the national bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights.
ISO/IEC 18014-1 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology,
Subcommittee SC 27, IT Security techniques.
This second edition cancels and replaces the first edition (ISO/IEC 18014-1:2002), which has been technically
revised.
ISO/IEC 18014 consists of the following parts, under the general title Information technology — Security
techniques — Time-stamping services:
⎯ Part 1: Framework
⎯ Part 2: Mechanisms producing independent tokens
⎯ Part 3: Mechanisms producing linked tokens

iv © ISO/IEC 2008 – All rights reserved

Introduction
The International Organization for Standardization (ISO) and International Electrotechnical Commission (IEC)
draw attention to the fact that it is claimed that compliance with this International Standard may involve the
use of patents.
ISO and IEC take no position concerning the evidence, validity and scope of these patent rights.
The holders of these patent rights have assured ISO and IEC that they are willing to negotiate licences under
reasonable and non-discriminatory terms and conditions with applicants throughout the world. In this respect,
the statements of the holders of these patent rights are registered with ISO and IEC. Information may be
obtained from:
ISO/IEC JTC 1/SC 27 Standing Document 8 (SD 8) "Patent Information"
SD 8 is publicly available at: http://www.din.de/ni/sc27
Attention is drawn to the possibility that some of the elements of this International Standard may be the
subject of patent rights other than those identified above. ISO and IEC shall not be held responsible for
identifying any or all such patent rights.

© ISO/IEC 2008 – All rights reserved v

INTERNATIONAL STANDARD ISO/IEC 18014-1:2008(E)

Information technology — Security techniques —
Time-stamping services —
Part 1:
Framework
1 Scope
This part of ISO/IEC 18014:
⎯ identifies the objective of a time-stamping authority;
⎯ describes a general model on which time-stamping services are based;
⎯ defines time-stamping services;
⎯ defines the basic protocols between the involved entities.
2 Normative references
The following referenced documents are indispensable for the application 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 8601, Data elements and interchange formats — Information interchange — Representation of dates and
times
ISO/IEC 10118 (all parts), Information technology — Security techniques — Hash-functions
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
certification authority
CA
centre trusted to create and assign public key certificates
NOTE Optionally, the certification authority can create and assign keys to the entities.
[ISO/IEC 11770-1:1996]
© ISO/IEC 2008 – All rights reserved 1

3.2
collision-resistant hash-function
hash-function satisfying the following property: it is computationally infeasible to find any two distinct inputs
which map to the same output
NOTE Computational feasibility depends on the specific security requirements and environment.
[ISO/IEC 10118-1:2000]
3.3
data items’ representation
data item or some representation thereof such as a cryptographic hash value
3.4
digital signature
data appended to, or a cryptographic transformation of, a data unit that allows a recipient of the data unit to
prove the origin and integrity of the data unit and protect the sender and the recipient of the data unit against
forgery by third parties and sender against forgery by the recipient
[ISO/IEC 11770-3:1999]
3.5
entity authentication
corroboration that an entity is the one claimed
[ISO/IEC 9798-1:1997]
3.6
hash-function
function which maps strings of bits to fixed-length strings of bits, satisfying the following two properties:
⎯ it is computationally infeasible to find for a given output, an input which maps to this output;
⎯ it is computationally infeasible to find for a given input, a second input which maps to the same output
NOTE Computational feasibility depends on the specific security requirements and environment.
[ISO/IEC 10118-1:2000]
3.7
hash value
string of bits which is the output of a hash-function
NOTE Identical to the definition of hash-code in ISO/IEC 10118-1:2000.
3.8
private key
that key of an entity’s asymmetric key pair which should only be used by that entity
[ISO/IEC 11770-1:1996]
3.9
public key
that key of an entity’s asymmetric key pair which can be made public
[ISO/IEC 11770-1:1996]
2 © ISO/IEC 2008 – All rights reserved

3.10
public key certificate
public key informatio
...

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