One-key MAC

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OMAC (One-key MAC) is a message authentication code constructed from a block cipher much like the CBC-MAC 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).

External links

v t e Cryptographic hash functions and message authentication codes (MACs) (Security summary)

Common functions	MD5 SHA-1 SHA-2 SHA-3/Keccak

SHA-3 finalists	BLAKE Grøstl JH Skein

Other functions	FSB ECOH GOST HAS-160 HAVAL LM hash MDC-2 MD2 MD4 MD6 N-Hash RadioGatún RIPEMD RTR0 SipHash Snefru SWIFFT Tiger VSH WHIRLPOOL crypt(3) (DES)

MAC algorithms	DAA CBC-MAC HMAC OMAC/CMAC PMAC VMAC UMAC Poly1305-AES

Authenticated encryption modes	CCM CWC EAX GCM IAPM OCB

Attacks	Collision attack Preimage attack Birthday attack Brute force attack Rainbow table Distinguishing attack Side-channel attack

Design	Avalanche effect Hash collision Merkle–Damgård construction

Standardization	CRYPTREC NESSIE NIST hash function competition

Utilization	Salt

v t e Cryptography

History of cryptography Cryptanalysis Cryptography portal Outline of cryptography

Symmetric-key algorithm Block cipher Stream cipher Public-key cryptography Cryptographic hash function Message authentication code Random numbers Steganography

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