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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 seldom used.[1] The preferred name is now "OMAC2".[2]
- The OMAC1 refinement,[2] which became an NIST recommendation in May 2005 under the name CMAC.[3]
OMAC is free for all uses: it is not covered by any patents.[4]
- ^ Cite error: The named reference
omac03was invoked but never defined (see the help page). - ^ a b Cite error: The named reference
omac1was invoked but never defined (see the help page). - ^ Dworkin, Morris (2016). "Recommendation for Block Cipher Modes of Operation: The CMAC Mode for Authentication" (PDF). doi:10.6028/nist.sp.800-38b.
{{cite journal}}: Cite journal requires|journal=(help) - ^ Rogaway, Phillip. "CMAC: Non-licensing". Retrieved May 27, 2020.
Phillip Rogaway's statement on intellectual property status of CMAC
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