Keyed-Hashing Message Authentication

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(messaging, cryptography)

Keyed-Hashing Message Authentication - (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].

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