One-key MAC
Encyclopedia
OMAC is a message authentication code
Message authentication code
In cryptography, a message authentication code is a short piece of information used to authenticate a message.A MAC algorithm, sometimes called a keyed hash function, accepts as input a secret key and an arbitrary-length message to be authenticated, and outputs a MAC...

 constructed from a block cipher
Block cipher
In cryptography, a block cipher is a symmetric key cipher operating on fixed-length groups of bits, called blocks, with an unvarying transformation. A block cipher encryption algorithm might take a 128-bit block of plaintext as input, and output a corresponding 128-bit block of ciphertext...

 much like the PMAC
PMAC (cryptography)
PMAC, which stands for Parallelizable MAC, is a message authentication code algorithm. It was created by Phillip Rogaway ....

 algorithm.

Officially there are two OMAC algorithms (OMAC1 and OMAC2) which are both essentially the same except for a small tweak.
OMAC1 is equivalent to CMAC
CMAC
In cryptography, CMAC is a block cipher-based message authentication code algorithm. It may be used to provide assurance of the authenticity and, hence, the integrity of binary data...

 which became an NIST recommendation in May 2005.

It is free for all uses (no patents).

External links

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