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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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