ISO/IEC 9796-2:2010
Information technology — Security techniques — Digital signature schemes giving message recovery — Part 2: Integer factorization based mechanisms
ISO/IEC 9796-2:2010 specifies three digital signature schemes giving message recovery, two of which are deterministic (non-randomized) and one of which is randomized. The security of all three schemes is based on the difficulty of factorizing large numbers. All three schemes can provide either total or partial message recovery.
ISO/IEC 9796-2:2010 specifies the method for key production for the three signature schemes. However, techniques for key management and for random number generation (as required for the randomized signature scheme), are outside the scope of ISO/IEC 9796-2:2010.
The first mechanism specified in ISO/IEC 9796-2:2010 is only applicable for existing implementations, and is retained for reasons of backward compatibility.
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1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviated terms
5 Converting between bit strings and integers
6 Requirements
7 Model for signature and verification processes
7.1 General
7.2 Signing a message
7.2.1 Overview
7.2.2 Message allocation
7.2.3 Message representative production
7.2.4 Signature production
7.3 Verifying a signature
7.3.1 Overview
7.3.2 Signature opening
7.3.3 Message recovery
7.3.4 Message assembly
7.4 Specifying a signature scheme
8 Digital signature scheme 1
8.1 General
8.2 Parameters
8.2.1 Modulus length
8.2.2 Trailer field options
8.2.3 Capacity
8.3 Message representative production
8.3.1 Hashing the message
8.3.2 Formatting
8.4 Message recovery
9 Digital signature scheme 2
9.1 General
9.2 Parameters
9.2.1 Modulus length
9.2.2 Salt length
9.2.3 Trailer field options
9.2.4 Capacity
9.3 Message representative production
9.3.1 Hashing the message
9.3.2 Formatting
9.4 Message recovery
10 Digital signature scheme 3
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1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviated terms
5 Converting between bit strings and integers
6 Requirements
7 Model for signature and verification processes
7.1 General
7.2 Signing a message
7.2.1 Overview
7.2.2 Message allocation
7.2.3 Message representative production
7.2.4 Signature production
7.3 Verifying a signature
7.3.1 Overview
7.3.2 Signature opening
7.3.3 Message recovery
7.3.4 Message assembly
7.4 Specifying a signature scheme
8 Digital signature scheme 1
8.1 General
8.2 Parameters
8.2.1 Modulus length
8.2.2 Trailer field options
8.2.3 Capacity
8.3 Message representative production
8.3.1 Hashing the message
8.3.2 Formatting
8.4 Message recovery
9 Digital signature scheme 2
9.1 General
9.2 Parameters
9.2.1 Modulus length
9.2.2 Salt length
9.2.3 Trailer field options
9.2.4 Capacity
9.3 Message representative production
9.3.1 Hashing the message
9.3.2 Formatting
9.4 Message recovery
10 Digital signature scheme 3