1、BSI Standards Publication BS ISO/IEC 18033-1:2015 Information technology Security techniques Encryption algorithms Part 1: GeneralBS ISO/IEC 18033-1:2015 BRITISH STANDARD National foreword This British Standard is the UK implementation of ISO/IEC 18033-1:2015. It supersedes BS ISO/IEC 18033-1:2005+A
2、1:2011 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee IST/33, IT - Security techniques. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary
3、provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2015. Published by BSI Standards Limited 2015 ISBN 978 0 580 76059 4 ICS 35.040 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was p
4、ublished under the authority of the Standards Policy and Strategy Committee on 31 July 2015. Amendments issued since publication Date Text affectedBS ISO/IEC 18033-1:2015 Information technology Security techniques Encryption algorithms Part 1: General Technologies de linformation Techniques de scuri
5、t Algorithmes de chiffrement Partie 1: Gnralits INTERNATIONAL STANDARD ISO/IEC 18033-1 Reference number ISO/IEC 18033-1:2015(E) Second edition 2015-08-01 ISO/IEC 2015 BS ISO/IEC 18033-1:2015ii ISO/IEC 2015 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO/IEC 2015, Published in Switzerland All ri
6、ghts reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from
7、either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Ch. de Blandonnet 8 CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyrightiso.org www.iso.org ISO/IEC 18033-1:2015(E)BS ISO/IEC 18033-1:2015ISO/IEC 1803
8、3-1:2015(E)Foreword iv Introduction v 1 Scope . 1 2 T erms and definitions . 1 3 Symbols and abbreviated terms . 5 3.1 Symbols . 5 3.2 Abbreviated terms . 5 4 The nature of encryption . 5 4.1 The purpose of encryption . 5 4.2 Symmetric and asymmetric ciphers . 6 4.3 Key management . 6 5 The use and
9、properties of encryption 6 5.1 Asymmetric ciphers 6 5.2 Block ciphers 7 5.2.1 General 7 5.2.2 Modes of operation 7 5.2.3 Message Authentication Codes (MACs) 7 5.3 Stream ciphers 7 5.4 Identity-based mechanisms . 8 6 Object identifiers . 8 Annex A (normative) Criteria for submission of ciphers for po
10、ssible inclusion in this International Standard 9 Annex B (normative) Criteria for the deletion of ciphers from this International Standard .13 Annex C (informative) Attacks on encryption algorithms .14 Bibliography .16 ISO/IEC 2015 All rights reserved iii Contents PageBS ISO/IEC 18033-1:2015ISO/IEC
11、 18033-1:2015(E) 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 Standar
12、ds 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 IE
13、C, 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. 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 t
14、he different approval criteria needed for the different types of document 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
15、 may be the subject of patent rights. ISO and IEC 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.is
16、o.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 meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the
17、WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information The committee responsible for this document is ISO/IEC JTC 1, Information technology, Subcommittee SC 27, Security techniques. This second edition cancels and replaces the first editio
18、n (ISO/IEC 18033-1:2005), which has been technically revised. It also incorporates the Amendment, ISO/IEC 18033-1:2005/Amd.1:2011. ISO/IEC 18033 consists of the following parts, under the general title Information technology Security techniques Encryption algorithms: Part 1: General Part 2: Asymmetr
19、ic ciphers Part 3: Block ciphers Part 4: Stream ciphers Part 5: Identity-based ciphersiv ISO/IEC 2015 All rights reservedBS ISO/IEC 18033-1:2015ISO/IEC 18033-1:2015(E) Introduction This multi-part International Standard specifies encryption systems (ciphers) for the purpose of data confidentiality.
20、The inclusion of ciphers in this International Standard is intended to promote their use as reflecting the current “state of the art” in encryption techniques. The primary purpose of encryption (or encipherment) techniques is to protect the confidentiality of stored or transmitted data. An encryptio
21、n algorithm is applied to data (often called plaintext or cleartext) to yield encrypted data (or ciphertext); this process is known as encryption. The encryption algorithm should be designed so that the ciphertext yields no information about the plaintext except, perhaps, its length. Associated with
22、 every encryption algorithm is a corresponding decryption algorithm, which transforms ciphertext back into its original plaintext. Ciphers work in association with a key. In a symmetric cipher, the same key is used in both the encryption and decryption algorithms. In an asymmetric cipher, different
23、but related keys are used for encryption and decryption. In this multi-part International Standard, ISO/IEC 18033-2 and ISO/IEC 18033-5 are devoted to two different classes of asymmetric ciphers, known as conventional asymmetric ciphers (or just asymmetric ciphers), and identity-based ciphers. ISO/I
24、EC 18033-3 and ISO/IEC 18033-4 are devoted to two different classes of symmetric ciphers, known as block ciphers and stream ciphers. ISO/IEC 2015 All rights reserved vBS ISO/IEC 18033-1:2015BS ISO/IEC 18033-1:2015Information technology Security techniques Encryption algorithms Part 1: General 1 Scop
25、e This part of ISO/IEC 18033 is general in nature, and provides definitions that apply in subsequent parts of this International Standard. The nature of encryption is introduced, and certain general aspects of its use and properties are described. The criteria used to select the algorithms specified
26、 in subsequent parts of this International Standard are defined in Annexes A and B. 2 T erms a nd definiti ons For the purposes of this document, the following terms and definitions apply. 2.1 asymmetric cipher alternative term for asymmetric encryption system 2.2 asymmetric cryptographic technique
27、cryptographic technique that uses two related transformations, a public transformation (defined by the public key) and a private transformation (defined by the private key) Note1 to entry: The two transformations have the property that, given the public transformation, it is computationally infeasib
28、le to derive the private transformation SOURCE: ISO/IEC 11770-1:2010, 2.1 2.3 asymmetric encipherment system alternative term for asymmetric encryption system 2.4 asymmetric encryption system system based on asymmetric cryptographic techniques whose public transformation is used for encryption and w
29、hose private transformation is used for decryption SOURCE: ISO/IEC 9798-1:2010, 3.2 2.5 asymmetric key pair pair of related keys for an asymmetric cryptographic technique where the private key defines the private transformation and the public key defines the public transformation 2.6 attack algorith
30、m that performs computations and makes queries to the encryption algorithm for the encryption and/or decryption of adaptively chosen texts under a single secret key, with the purpose of recovering either the unknown plaintext for a given ciphertext, which may be adaptively chosen but for which a dec
31、ryption query is not issued, or a secret key INTERNATIONAL ST ANDARD ISO/IEC 18033-1:2015(E) ISO/IEC 2015 All rights reserved 1BS ISO/IEC 18033-1:2015ISO/IEC 18033-1:2015(E) 2.7 attack cost ratio of the average complexity of the attack algorithm measured in terms of the number of calls to the encryp
32、tion algorithm made by the attack to the probability of success of the attack Note 1 to entry: Using the notation defined in 3.1, the attack cost is equal to the ratio W/P. 2.8 block string of bits of a defined length 2.9 block cipher symmetric encipherment system with the property that the encrypti
33、on algorithm operates on a block of plaintext, i.e. a string of bits of a defined length, to yield a block of ciphertext 2.10 cipher alternative term for encipherment system 2.11 ciphertext data which has been transformed to hide its information content SOURCE: ISO/IEC 10116:2006, 3.3 2.12 cleartext
34、 alternative term for plaintext 2.13 cryptanalytic attack attack against a cipher that makes use of properties of the cipher Note 1 to entry: Every cryptanalytic attack has its own attack model, some of which may or may not be applicable to specific implementations. Since the application of a cipher
35、 is generally unknown to the cipher designer, all possible models in the single key setting are considered when assessing the security of an algorithm. Note 2 to entry: Cryptanalytic attacks do not include implementation specific attacks, e.g. side channel analysis. 2.14 decipherment alternative ter
36、m for decryption 2.15 decipherment algorithm alternative term for decryption algorithm 2.16 decryption reversal of a corresponding encipherment SOURCE: ISO/IEC 11770-1:2010, 2.6, modified 2.17 decryption algorithm process which transforms ciphertext into plaintext 2.18 encipherment alternative term
37、for encryption2 ISO/IEC 2015 All rights reservedBS ISO/IEC 18033-1:2015ISO/IEC 18033-1:2015(E) 2.19 encipherment algorithm alternative term for encryption algorithm 2.20 encipherment system alternative term for encryption system 2.21 encryption (reversible) transformation of data by a cryptographic
38、algorithm to produce ciphertext, i.e. to hide the information content of the data SOURCE: ISO/IEC 9797-1:2011, 3.6, modified 2.22 encryption algorithm process which transforms plaintext into ciphertext 2.23 encryption system cryptographic technique used to protect the confidentiality of data, and wh
39、ich consists of three component processes: an encryption algorithm, a decryption algorithm, and a method for generating keys 2.24 generic attack attack against a cipher which does not rely on the cipher design and can be used to recover an encryption key or plaintext 2.25 identity-based cipher alter
40、native term for identity-based encryption system 2.26 identity-based encryption system asymmetric cipher in which the encryption algorithm takes an arbitrary string as a public key 2.27 key sequence of symbols that controls the operation of a cryptographic transformation (e.g., encipherment, deciphe
41、rment) SOURCE: ISO/IEC 11770-1:2010, 2.12, modified 2.28 keystream pseudorandom sequence of symbols, intended to be secret, used by the encryption and decryption algorithms of a stream cipher Note 1 to entry: Note1 to entry: If a portion of the keystream is known by an attacker, then it shall be com
42、putationally infeasible for the attacker to deduce any information about the remainder of the keystream. 2.29 n-bit block cipher block cipher with the property that plaintext blocks and ciphertext blocks are n bits in length SOURCE: ISO/IEC 10116:2006, 3.10 ISO/IEC 2015 All rights reserved 3BS ISO/I
43、EC 18033-1:2015ISO/IEC 18033-1:2015(E) 2.30 plaintext unencrypted information SOURCE: ISO/IEC 10116:2006, 3.11 2.31 private key key of an entitys asymmetric key pair which should only be used by that entity Note 1 to entry: A private key should not normally be disclosed. SOURCE: ISO/IEC 11770-1:2010
44、, 2.35, modified 2.32 public key key of an entitys asymmetric key pair which can be made public SOURCE: ISO/IEC 11770-1:2010, 2.36, modified 2.33 secret key key used with symmetric cryptographic techniques by a specified set of entities SOURCE: ISO/IEC 11770-3:2008, 3.35 2.34 security strength numbe
45、r associated with the amount of work (e.g. the number of operations) that is required to break a cryptographic algorithm or system Note 1 to entry: For key recovery, a security strength of n bits implies that the workload required to break the cryptosystem is equivalent to 2 nexecutions of the crypt
46、osystem. For further information on the application of security strength to selecting cryptographic algorithms for this International Standard, see C.1.4. Note 2 to entry: In ISO/IEC 29192, security strength is specified in bits, e.g. 80, 112, 128, 192, or 256. 2.35 self-synchronous stream cipher st
47、ream cipher with the property that the keystream symbols are generated as a function of a secret key and a fixed number of previous ciphertext bits 2.36 stream cipher symmetric encryption system with the property that the encryption algorithm involves combining a sequence of plaintext symbols with a
48、 sequence of keystream symbols one symbol at a time, using an invertible function Note 1 to entry: Two types of stream cipher can be identified: synchronous stream ciphers and self-synchronous stream ciphers, distinguished by the method used to obtain the keystream. 2.37 symmetric cipher alternative
49、 term for symmetric encryption system 2.38 symmetric cryptographic technique cryptographic technique that uses the same secret key for both the originators and the recipients transformation Note 1 to entry: Without knowledge of the secret key, it is computationally infeasible to compute either the originators or the recipients transformation.4 ISO/IEC 2015 All rights reservedBS ISO/IEC 18033-1:2015ISO/IEC 18033-1:2015(E) 2.39 symmetric encipherme
