1、Information technology Securi ty techniques Encryption algorithms Part 4: Stream ciphersCAN/CSA-ISO/IEC 18033-4:13(ISO/IEC 18033-4:2011, IDT)National Standard of CanadaNOT FOR RESALE. / PUBLICATION NON DESTINE LA REVENTE.Legal Notice for StandardsCanadian Standards Association (operating as “CSA Gro
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20、e sera produite par lorganisme rdacteur.TMA trade-mark of the Canadian Standards Association, operating as “CSA Group”National Standard of CanadaPublished in January 2013 by CSA GroupA not-for-profit private sector organization5060 Spectrum Way, Suite 100, Mississauga, Ontario, Canada L4W 5N61-800-4
21、63-6727 416-747-4044Visit our Online Store at shop.csa.caApproved byStandards Council of CanadaCAN/CSA-ISO/IEC 18033-4:13Information technology Security techniques Encryption algorithms Part 4: Stream ciphersPrepared by InternationalOrganizationforStandardization/ International Electrotechnical Comm
22、issionReviewed byCAN/CSA-ISO/IEC 18033-4:13Information technology Security techniques Encryption algorithms Part 4: Stream ciphersCSA/4 2013 CSA Group January 2013CAN/CSA-ISO/IEC 18033-4:13Information technology Security techniques Encryption algorithms Part 4: Stream ciphersCSA PrefaceStandards dev
23、elopment within the Information Technology sector is harmonized with international standards development. Through the CSA Technical Committee on Information Technology (TCIT), Canadians serve as the Canadian Advisory Committee (CAC) on ISO/IEC Joint Technical Committee 1 on Information Technology (I
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25、tee (ITU-T).This Standard supersedes CAN/CSA-ISO/IEC 18033-4-06 (adoption of ISO/IEC 18033-4:2005).At the time of publication, ISO/IEC 18033-4:2011 is available from ISO and IEC in English only. CSA Group will publish the French version when it becomes available from ISO and IEC.This International S
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31、Standard designation (number);(b) relevant clause, table, and/or figure number;(c) wording of the proposed change; and(d) rationale for the change.Reference numberISO/IEC 18033-4:2011(E)ISO/IEC 2011INTERNATIONAL STANDARD ISO/IEC18033-4Second edition2011-12-15Information technology Security technique
32、s Encryption algorithms Part 4: Stream ciphers Technologies de linformation Techniques de scurit Algorithmes de chiffrement Partie 4: Chiffrements en flot ISO/IEC 18033-4:2011(E) COPYRIGHT PROTECTED DOCUMENT ISO/IEC 2011 All rights reserved. Unless otherwise specified, no part of this publication ma
33、y 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 ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel.
34、 + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org ii ISO/IEC 2011 All rights reservedISO/IEC 18033-4:2011(E) ISO/IEC 2011 All rights reserved iiiContents Page Foreword iv Introduction . v 1 Scope 1 2 Normative references 1 3 Terms and definitions . 1 4 Symbols and abbr
35、eviated terms 3 4.1 Symbols 3 4.2 Functions . 5 5 Framework for stream ciphers . 6 6 General models for stream ciphers . 6 6.1 Keystream generators . 6 6.2 Output functions 7 7 Constructing keystream generators from block ciphers 10 7.1 Block cipher modes for a synchronous keystream generator . 10 7
36、.2 Block cipher mode for a self-synchronizing keystream generator 12 8 Dedicated keystream generators . 13 8.1 MUGI keystream generator . 13 8.2 SNOW 2.0 keystream generator . 18 8.3 Rabbit keystream generator . 23 8.4 Decimv2keystream generator 27 8.5 KCipher-2 (K2) keystream generator . 33 Annex A
37、 (normative) Object Identifiers 43 Annex B (informative) Operations over the finite field GF(2n) . 45 Annex C (informative) Examples . 46 Annex D (informative) Security information . 88 Bibliography 91 ISO/IEC 18033-4:2011(E) iv ISO/IEC 2011 All rights reservedForeword ISO (the International Organiz
38、ation 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 respe
39、ctive 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 informati
40、on 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
41、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
42、the subject of patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights. ISO/IEC 18033-4 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 27, IT Security techniques. This second edition cancels and replaces
43、 the first edition (ISO/IEC 18033-4:2005), which has been technically revised. It also incorporates the Amendment ISO/IEC 18033-4:2005/Amd.1:2009. ISO/IEC 18033 consists of the following parts, under the general title Information technology Security techniques Encryption algorithms: Part 1: General
44、Part 2: Asymmetric ciphers Part 3: Block ciphers Part 4: Stream ciphers ISO/IEC 18033-4:2011(E) ISO/IEC 2011 All rights reserved vIntroduction This part of ISO/IEC 18033 includes stream cipher algorithms. A stream cipher is an encryption mechanism that uses a keystream to encrypt a plaintext in a bi
45、twise or a block-wise manner. There are two types of stream ciphers: a synchronous stream cipher, in which the keystream is generated from only the secret key (and an initialization vector) and a self-synchronizing stream cipher, in which the keystream is generated from the secret key and some past
46、ciphertexts (and an initialization vector). This part of ISO/IEC 18033 describes both pseudorandom number generators for producing keystream and output functions to combine a keystream with plaintext. This part of ISO/IEC 18033 includes two output functions: Binary-additive output function; and MULT
47、I-S01 output function. This part of ISO/IEC 18033 includes five dedicated keystream generators: MUGI keystream generator; SNOW 2.0 keystream generator; Rabbit keystream generator; Decimv2keystream generator; and KCipher-2 (K2) keystream generator. INTERNATIONAL STANDARD ISO/IEC 18033-4:2011(E) ISO/I
48、EC 2011 All rights reserved 1Information technology Security techniques Encryption algorithms Part 4: Stream ciphers 1 Scope This part of ISO/IEC 18033 specifies a) output functions to combine a keystream with plaintext, b) keystream generators for producing keystream, and c) object identifiers assi
49、gned to dedicated keystream generators in accordance with ISO/IEC 9834. NOTE 1 The list of assigned object identifiers is given in Annex A. NOTE 2 Any change to the specification of these algorithms resulting in a change of functional behaviour will result in a change of the object identifier assigned to
