AS 2805.5.2-1992

1 - AS 2805.5.2-1992 ELECTRONIC FUNDS TRANSFER-REQUIREMENTS FOR INTERFACES - MODES OF OPERATION FOR AN N-BIT BLOCK CIPHER ALGORIT
4 - PREFACE
4 - CONTENTS
5 - FOREWORD
6 - 1 SCOPE
6 - 2 APPLICATION
6 - 3 REFERENCED DOCUMENTS
6 - 4 DEFINITIONS
6 - 4.1 Block chaining
6 - 4.2 Ciphertext
6 - 4.3 Data encipherment algorithm (DEA)
6 - 4.4 Decipherment
6 - 4.5 Encipherment
6 - 4.6 Initializing value (IV)
6 - 4.7 Key
6 - 4.8 Modulo 2 addition
6 - 4.9 n-bit block cipher algorithm
6 - 4.10 Plaintext
6 - 4.11 Starting variable (SV)
6 - 4.12 Cryptographic synchronization
7 - 5 NOTATION
7 - 5.1 Functional relation
7 - 5.2 Addi tion
7 - 5.3 Selection
7 - 5.4 Shift function
7 - 6 ELECTRONIC CODEBOOK (ECB) MODE
7 - 6.1 Variables
7 - 6.2 Encipherment operation
7 - 6.3 Decipherment operation
7 - 7 CIPHER BLOCK CHAINING (CBC) MODE
7 - 7.1 Variables
7 - 7.2 Encipherment operation
8 - 7.3 Decipherment operation
8 - 8 CIPHER FEEDBACK (CFB) MODE
8 - 8.1 Parameters and variables
9 - 8.2 Encipherment operation
9 - 8.3 Decipherment operation
10 - 8.4 Parameter length recommendation
10 - 9 OUTPUT FEEDBACK (OFB) MODE
10 - 9.1 Parameters and variables
10 - 9.2 Encipherment operation
10 - 9.3 Decipherment operation
12 - APPENDIX A - THE PROPERTIES OF THE MODES OF OPERATION
12 - A1 PROPERTIES OF THE ELECTRONIC CODEBOOK (ECB) MODE OF OPERATION
12 - A1.1 Environment
12 - A1.2 Properties
12 - A1.3 Padding requirements
12 - A1.4 Error propagation
12 - A1.5 Block boundaries
12 - A2 PROPERTIES OF THE CIPHER BLOCK CHAINING (CBC) MODE OF OPERATION
12 - A2.1 Environment
12 - A2.2 Properties
12 - A2.3 Padding requirements
13 - A2.4 Error propagation
13 - A2.5 Block boundaries
13 - A3 PROPERTIES OF THE CIPHER FEEDBACK (CFB) MODE OF OPERATION
13 - A3.1 Environment
13 - A3.2 Properties
13 - A3.3 Padding requirements
13 - A3.4 Error propagation
13 - A3.5 Block boundaries
13 - A4 PROPERTIES OF THE OUTPUT FEEDBACK (OFB) MODE OF OPERATION
13 - A4.1 Environment
14 - A4.2 Properties
14 - A4.3 Padding requirements
14 - A4.4 Error propagation
14 - A4.5 Block boundaries
15 - APPENDIX B - EXAMPLES OF MODES OF OPERATION
15 - B1 GENERAL
15 - B2 ECB MODE
15 - B3 CBC MODE
15 - B4 CFB MODE
15 - B5 OFB MODE

Describes four modes of operation for an n-bit block cipher algorithm using a secret key. AS 2805.5-1985 has been revised and split into a number of parts to make provision for a wider range of encipherment techniques.

This Standard describes four modes of operation for an n-bit block cipher algorithm.NOTE: Appendix A contains comments on the properties of each mode.

First published as part of AS 2805.5-1985.
Revised and redesignated in part as AS 2805.5.2-1992.