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One-key MAC
From Wikipedia, the free encyclopedia
OMAC (One-key MAC) is a message authentication code constructed from a block cipher much like the PMAC 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 which became an NIST recommendation in May 2005.
It is free for all uses (no patents).
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