One-key MAC
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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 drafted to become a NIST standard and is free for all uses (no patents).
External links
- More information on OMAC (http://crypt.cis.ibaraki.ac.jp/omac/omac.html)