1. Briefly explain the operational block of RIPEMD-160.
2. What is HMAC?
3. Mention the design objective of HMAC.
1. Briefly explain HMAC algorithm step and its working block.
2. Mention the features of Whirlpool.
3. Mention the security goals of Whirlpool.
4. Mention the hash function expression in Whirlpool.
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