Dansk standard DS/ISO/IEC 18014-3 2. udgave 2010-02-05 Informationsteknologi Sikkerhedsteknikker Tidsregistrering Del 3: Mekanismer, der producerer sammenhængende tokens Information technology Security techniques Time-stamping services Part 3: Mechanisms producing linked tokens
DS/ISO/IEC 18014-3 København DS projekt: M226491 ICS: 35.040 Første del af denne publikations betegnelse er: DS/ISO/IEC, hvilket betyder, at det er en international standard, der har status som dansk standard. Denne publikations overensstemmelse er: IDT med: ISO IEC 18014-3:2009. DS-publikationen er på engelsk. Denne publikation erstatter: DS/ISO/IEC 18014-3:2004. DS-publikationstyper Dansk Standard udgiver forskellige publikationstyper. Typen på denne publikation fremgår af forsiden. Der kan være tale om: Dansk standard standard, der er udarbejdet på nationalt niveau, eller som er baseret på et andet lands nationale standard, eller standard, der er udarbejdet på internationalt og/eller europæisk niveau, og som har fået status som dansk standard DS-information publikation, der er udarbejdet på nationalt niveau, og som ikke har opnået status som standard, eller publikation, der er udarbejdet på internationalt og/eller europæisk niveau, og som ikke har fået status som standard, fx en teknisk rapport, eller europæisk præstandard DS-håndbog samling af standarder, eventuelt suppleret med informativt materiale DS-hæfte publikation med informativt materiale Til disse publikationstyper kan endvidere udgives tillæg og rettelsesblade DS-publikationsform Publikationstyperne udgives i forskellig form som henholdsvis fuldtekstpublikation (publikationen er trykt i sin helhed) godkendelsesblad (publikationen leveres i kopi med et trykt DS-omslag) elektronisk (publikationen leveres på et elektronisk medie) DS-betegnelse Alle DS-publikationers betegnelse begynder med DS efterfulgt af et eller flere præfikser og et nr., fx DS 383, DS/EN 5414 osv. Hvis der efter nr. er angivet et A eller Cor, betyder det, enten at det er et tillæg eller et rettelsesblad til hovedstandarden, eller at det er indført i hovedstandarden. DS-betegnelse angives på forsiden. Overensstemmelse med anden publikation: Overensstemmelse kan enten være IDT, EQV, NEQ eller MOD IDT: Når publikationen er identisk med en given publikation. EQV: Når publikationen teknisk er i overensstemmelse med en given publikation, men præsentationen er ændret. NEQ: Når publikationen teknisk eller præsentationsmæssigt ikke er i overensstemmelse med en given standard, men udarbejdet på baggrund af denne. MOD: Når publikationen er modificeret i forhold til en given publikation.
INTERNATIONAL STANDARD ISO/IEC 18014-3 Second edition 2009-12-15 Information technology Security techniques Time-stamping services Part 3: Mechanisms producing linked tokens Technologies de l'information Techniques de sécurité Services d'horodatage Partie 3: Mécanismes produisant des jetons liés Reference number ISO/IEC 18014-3:2009(E) ISO/IEC 2009
ISO/IEC 18014-3:2009(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO/IEC 2009 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 Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyright@iso.org Web www.iso.org Published in Switzerland ii ISO/IEC 2009 All rights reserved
ISO/IEC 18014-3:2009(E) Contents Page Foreword...iv Introduction...v 1 Scope...1 2 Normative references...1 3 Terms and definitions...1 4 General discussion...3 5 Operations specific to TSAs producing linked tokens...3 5.1 Linking operation...3 5.2 Aggregation operation...4 5.3 Publishing operation...5 5.4 Extend operation...5 6 Message formats...5 6.1 Time-stamp request...5 6.2 Time-stamp response...6 6.3 Verify request...6 6.4 Verify response...7 6.5 Extend request...7 6.6 Extend response...7 7 Data types...8 7.1 Object identifiers...8 7.2 TSTInfo...8 7.3 TimeStampToken...9 7.4 BindingInfo...10 7.5 Chain...11 7.6 Link...11 7.7 Node...12 7.8 PublicationInfo...12 7.9 Extensions...13 8 Generating a time-stamp token...15 8.1 General...15 8.2 DigestedData encapsulation...16 8.3 SignedData encapsulation...16 8.4 Security considerations...17 9 Verifying a time-stamp token...17 9.1 General...17 9.2 DigestedData encapsulation...18 9.3 SignedData encapsulation...18 9.4 Security considerations...18 10 Extending a time-stamp token...18 11 Renewing a time-stamp token...19 11.1 General...19 11.2 Renewal and verify operation...19 11.3 Renewal and extend operation...19 Annex A (normative) ASN.1 Module for time-stamping...21 Annex B (informative) Additional discussion...29 Annex C (informative) Data structures...33 Bibliography...37 ISO/IEC 2009 All rights reserved iii
ISO/IEC 18014-3:2009(E) 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. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member 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 shall not be held responsible for identifying any or all such patent rights. ISO/IEC 18014-3 was prepared by Technical Committee ISO/TC JTC 1, Information technology, Subcommittee SC 27, IT Security techniques. This second edition replaces and cancels the first edition (ISO/IEC 18014-3:2004), which has been technically revised. New message formats and data types are defined to support a protocol for extending an existing linked token with data items referring to a published value issued by the TSA. The data type clauses have been expanded and re-ordered, and the ASN.1 definitions in Annex A have been updated and reordered in line with the contents of the clauses in the main body of this International Standard. Annexes B and C have been updated. 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 2009 All rights reserved
ISO/IEC 18014-3:2009(E) Introduction ISO/IEC 18014-1 provides a general framework for the provision of time-stamping services. This part of ISO/IEC 18014 specifies mechanisms producing linked tokens, that is, time-stamp tokens that are related, or linked, to other time-stamp tokens produced by the methods and processes described in this document. A time stamping authority (TSA) can utilise the methods and processes described within this document to provide a secure, verifiable cryptographic binding between a certain point in time and data values, in a way that enhances the security of the resulting token. ISO/IEC 2009 All rights reserved v
INTERNATIONAL STANDARD ISO/IEC 18014-3:2009(E) Information technology Security techniques Timestamping services Part 3: Mechanisms producing linked tokens 1 Scope This part of ISO/IEC 18014 describes a general model for time-stamping services producing linked tokens, describes the basic components used to construct a time-stamping service producing linked tokens, defines the data structures used to interact with a time-stamping service producing linked tokens, describes specific instances of time-stamping services producing linked tokens, and defines a protocol to be utilized by time-stamping services producing linked tokens for the purpose of extending linked tokens to published values. 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/IEC 10118 (all parts), Information technology Security techniques Hash-functions ISO/IEC 18014-1:2008, Information technology Security techniques Time-stamping services Part 1: Framework 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 aggregation process of generating a proxy data item for a group of data items that are linked together, producing a verifiable cryptographic link between each data item and the rest of the group 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 [ISO/IEC 10118-1:2000, definition 3.2] ISO/IEC 2009 All rights reserved 1