Message authentication codes

UMAC

In cryptography, a message authentication code based on universal hashing, or UMAC, is a type of message authentication code (MAC) calculated choosing a hash function from a class of hash functions according to some secret (random) process and applying it to the message. The resulting digest or fingerprint is then encrypted to hide the identity of the hash function used. As with any MAC, it may be used to simultaneously verify both the data integrity and the authenticity of a message. A specific type of UMAC, also commonly referred to just UMAC, is specified in RFC 4418, it has provable cryptographic strength and is usually a lot less computationally intensive than other MACs. UMAC's design is optimized for 32-bit architectures with SIMD support, with a performance of 1 CPU cycle per byte (cpb) with SIMD and 2 cpb without SIMD. A closely related variant of UMAC that is optimized for 64-bit architectures is given by VMAC, which has been submitted to the IETF as a draft (draft-krovetz-vmac-01) but never gathered enough attention for becoming a standardized RFC. (Wikipedia).

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Related pages

Key derivation function | Prime number | Initialization vector | Data integrity | One-time pad | Universal hashing | Finite field | Modular arithmetic | Message authentication code | Cryptographic nonce | Poly1305 | Pseudorandom generator | Block cipher mode of operation | Cryptography | VMAC