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What is the best hash for HMAC?
The answer is: for the best interoperability, security, and efficiency, HMAC is best instantiated with SHA256 as HMAC-SHA256.
Let me explain.
History
HMAC was first proposed in the paper "Keying Hash Functions for Message Authentication" by Mihir Bellare, Ran Canettiy, and Hugo Krawczyk in 1996, as a construction ...
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