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The definition and analysis of the HMAC construction was first published in 1996 by Mihir Bellare, Ran Canetti, and Hugo Krawczyk, who also wrote RFC 2104.
This paper also defined a variant called NMAC that is rarely if ever used.
FIPS PUB 198 generalizes and standardizes the use of HMACs.
HMAC-SHA-1 and HMAC-MD5 are used within the IPsec and TLS protocols.

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