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ISO/IEC 10116:2017

(Main)

Information technology — Security techniques — Modes of operation for an n-bit block cipher

Information technology — Security techniques — Modes of operation for an n-bit block cipher

ISO/IEC 10116:2017 data during transmission or in storage). The defined modes only provide protection of data confidentiality. Protection of data integrity is not within the scope of this document. Also, most modes do not protect the confidentiality of message length information. NOTE 1 Methods for protecting the integrity of data using a block cipher are provided in ISO/IEC 9797-1. NOTE 2 Methods for simultaneously protecting the confidentiality and integrity of data are provided in ISO/IEC 19772. ISO/IEC 10116:2017 specifies the modes of operation and gives recommendations for choosing values of parameters (as appropriate). NOTE 3 The modes of operation specified in this document have been assigned object identifiers in accordance with ISO/IEC 9834. The list of assigned object identifiers is given in Annex A. In applications in which object identifiers are used, the object identifiers specified in Annex A are to be used in preference to any other object identifiers that can exist for the mode concerned. NOTE 4 Annex B contains comments on the properties of each mode and important security guidance.

Technologies de l'information — Techniques de sécurité — Modes opératoires pour un chiffrement par blocs de n bits

General Information

Status
Published
Publication Date
10-Jul-2017
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
9093 - International Standard confirmed
Start Date
05-May-2023
Completion Date
19-Apr-2025
Ref Project

Relations

Amended By
ISO/IEC 10116:2017/Amd 1:2021 - Information technology — Security techniques — Modes of operation for an n-bit block cipher — Amendment 1: CTR-ACPKM mode of operation
Effective Date
11-Dec-2021
Revises
ISO/IEC 10116:2006 - Information technology — Security techniques — Modes of operation for an n-bit block cipher
Effective Date
20-Jul-2013
ISO/IEC 10116:2017 - Information technology -- Security techniques -- Modes of operation for an n-bit block cipherISO/IEC 10116:2017 - Information technology -- Security techniques -- Modes of operation for an n-bit block cipher
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ISO/IEC 10116:2017 - Information technology -- Security techniques -- Modes of operation for an n-bit block cipher
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INTERNATIONAL ISO/IEC
STANDARD 10116
Fourth edition
2017-07
Information technology — Security
techniques — Modes of operation for
an n-bit block cipher
Technologies de l’information — Techniques de sécurité — Modes
opératoires pour un chiffrement par blocs de n bits
Reference number
©
ISO/IEC 2017
© ISO/IEC 2017, Published in Switzerland
All rights 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 either ISO at the address below or ISO’s 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
copyright@iso.org
www.iso.org
ii © ISO/IEC 2017 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols, abbreviated terms and notation . 3
4.1 Symbols and abbreviated terms. 3
4.2 Notation . 4
5 Requirements . 4
6 Electronic Codebook (ECB) mode . 5
6.1 Preliminaries . 5
6.2 Encryption . 5
6.3 Decryption . 5
7 Cipher Block Chaining (CBC) mode . 6
7.1 Preliminaries . 6
7.2 Encryption . 6
7.3 Decryption . 6
7.4 Avoiding ciphertext expansion . 7
7.4.1 General. 7
7.4.2 Three ciphertext stealing variants of CBC . 7
8 Cipher Feedback (CFB) mode . 8
8.1 Preliminaries . 8
8.2 Encryption . 9
8.3 Decryption .10
8.4 Avoiding ciphertext expansion .10
9 Output Feedback (OFB) mode.11
9.1 Preliminaries .11
9.2 Encryption .11
9.3 Decryption .12
9.4 Avoiding ciphertext expansion .12
10 Counter (CTR) mode .13
10.1 Preliminaries .13
10.2 Encryption .13
10.3 Decryption .14
10.4 Avoiding ciphertext expansion .14
Annex A (normative) Object identifiers .15
Annex B (informative) Properties of the modes of operation and important security guidance .17
Annex C (informative) Figures describing the modes of operation.22
Annex D (informative) Numerical examples for the modes of operation .27
Bibliography .39
© ISO/IEC 2017 – 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.
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 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 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 .iso .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 voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO’s adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following
URL: w w w . i s o .org/ iso/ foreword .html.
This document was prepared by Technical Committee ISO/IEC JTC 1, Information technology, SC 27, IT
Security techniques.
This fourth edition cancels and replaces the third edition (ISO/IEC 10116:2006) and
ISO/IEC 10116:2006/Cor1: 2008, which have been technically revised.
The main technical changes between the third edition and this fourth edition are as follows:
a) the inclusion of padding within the normative scope of ISO/IEC 10116;
b) the inclusion of methods for avoiding ciphertext expansion for CBC, CFB, OFB and CTR modes.
iv © ISO/IEC 2017 – All rights reserved

Introduction
This document specifies modes of operation for an n-bit block cipher. These modes provide methods for
encrypting and decrypting data using a block cipher.
This fourth edition of ISO/IEC 10116 specifies five modes of operation:
a) Electronic Codebook (ECB);
b) Cipher Block Chaining (CBC);
c) Cipher Feedback (CFB);
d) Output Feedback (OFB);
e) Counter (CTR).
NOTE Annex C presents figures describing the modes of operation. Annex D provides numerical examples of
the modes of operation.
© ISO/IEC 2017 – All rights reserved v

INTERNATIONAL STANDARD ISO/IEC 10116:2017(E)
Information technology — Security techniques — Modes of
operation for an n-bit block cipher
1 Scope
This document establishes five modes of operation for applications of an n-bit block cipher (e.g.
protection of data during transmission or in storage). The defined modes only provide protection of
data confidentiality. Protection of data integrity is not within the scope of this document. Also, most
modes do not protect the confidentiality of message length information.
NOTE 1 Methods for protecting the integrity of data using a block cipher are provided in ISO/IEC 9797-1.
NOTE 2 Methods for simultaneously protecting the confidentiality and integrity of data are provided in
ISO/IEC 19772.
This document specifies the modes of operation and gives recommendations for choosing values of
parameters (as appropriate).
NOTE 3 The modes of operation specified in this document have been assigned object identifiers in accordance
with ISO/IEC 9834. The list of assigned object identifiers is given in Annex A. In applications in which object
identifiers are used, the object identifiers specified in Annex A are to be used in preference to any other object
identifiers that can exist for the mode concerned.
NOTE 4 Annex B contains comments on the properties of each mode and important security guidance.
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/IEC 18033-3, Information technology — Security techniques — Encryption algorithms — Part 3: Block
ciphers.
ISO/IEC 29192-2, Information technology — Security techniques — Lightweight cryptography — Part 2:
Block ciphers.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http:// www .electropedia .org/
— ISO Online browsing platform: available at http:// www .iso .org/ obp
3.1
block cipher
symmetric encipherment system with the property that the encryption algorithm operates on a block
of plaintext, i.e. a string of bits of a defined length, to yield a block of ciphertext
[SOURCE: ISO/IEC 18033-1:2015, 2.9]
© ISO/IEC 2017 – All rights reserved
...

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