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How many iterations / rounds does the Keccak function have ?

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How many iterations / rounds does the Keccak function have ?

(a) 12

(b) 36

(c) 16

(d) 24

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I want to ask this question from Secure Hash Algorithms (SHA) in portion Other Public Key Cryptosystems and Cryptographic Hash Functions of Cryptograph & Network Security

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Correct answer is (d) 24

The explanation: The Keccak function has 24 rounds, each of which has 5 step functions.

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