keyed-hashing message authentication

from The Free On-line Dictionary of Computing (8 July 2008)

Keyed-Hashing Message Authentication
HMAC

   <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.

   [RFC 2104].

   (1997-05-10)