One-key MAC

One-key MAC (OMAC) is a family of message authentication codes constructed from a block cipher much like the CBC-MAC algorithm. It may be used to provide assurance of the authenticity and, hence, the integrity of data. Two versions are defined:

  • The original OMAC of February 2003, which is rarely used. The preferred name is now "OMAC2".
  • The OMAC1 refinement, which became an NIST recommendation in May 2005 under the name CMAC.

OMAC is free for all uses: it is not covered by any patents.

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