abbreviation Technical meaning of HMAC Keyed-Hashing Message Authentication 3
noun Definition of hmac in Technology (messaging, cryptography) (HMAC) A mechanism for message authentication using cryptographic hash functions. HMAC can be used with any iterative cryptographic hash function, e.g., MD5, SHA-1, in combination with a secret shared key. The cryptographic strength of HMAC depends on the properties of the underlying hash function. 1
