Keyed-Hashing Message Authentication
<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)
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