Hot answers tagged hmac
In HMAC, the key $K$ [after it has been replaced by $H(K)$ if $K$ was wider than the hash's internal block size] is padded with zeros to the hash's internal block size. The question asks why this padding. In a nutshell: the security argument of HMAC would not hold without that. HMAC's original and improved security arguments make heavy use of the ...
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