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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

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