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Which step function provides most amount of diffusion for the Keccak iteration step?

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Which step function provides most amount of diffusion for the Keccak iteration step?

(a) Theta

(b) Rho

(c) Pi

(d) Chi

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Question is from Secure Hash Algorithms (SHA) topic in division Other Public Key Cryptosystems and Cryptographic Hash Functions of Cryptograph & Network Security

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Right answer is (a) Theta

To explain I would say: The Theta step function provides the most significant amount of diffusion for the SHA-3.

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