Cryptography and Network Security (CS435). Part Ten (Hash and MAC algorithms). Hash Algorithm Structure. Secure Hash Algorithm. SHA originally designed by NIST & NSA in 1993 was revised in 1995 as SHA-1 US standard for use with DSA signature scheme
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(Hash and MAC algorithms)
KeyedHash = Hash(Key|Message)
HMACK = Hash[(K+ XOR opad) ||
Hash[(K+ XOR ipad)||M)]]