Message authentication code
lastmod 2018-08-17created 2015-03-135 edits
A message authentication code (MAC) is a small piece of information used to authenticate a message. A MAC algorithm takes a secret key as input and authenticates a message of arbitrary length. It then outputs a MAC (sometimes known as a tag). The MAC value protects the integrity as well as the data authenticity of a message by allowing verifiers (those who possess the secret key) to check it.
Cryptographic hash function & Message authentication code
| Common functions | |
| Functions | FSB, SHA-3, ECOH, GOST, HAS-160, HAVAL, LM hash, MDC-2, MD2, MD4, MD6, N-Hash, RadioGatun, RIPEMD, Snefru, SWIFFT, Tiger, VSH, WHIRLPOOL, crypt (DES) |
| SHA-3 finalists | BLAKE, Grøstl, JH, Keccak, Skein |
| 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 |
| Misc | Avalanche effect, Hash collision, Merkle?Damgard construction, Salt |
| Standardization | CRYPTREC, NESSIE, NIST hash function competition |