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In SHA-3, which function does the operation L[2,3]<- C[1] XOR L[2,3] XOR ROT(C[3],1) represent?

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In SHA-3, which function does the operation L[2,3]<- C[1]  XOR L[2,3]  XOR  ROT(C[3],1) represent?

(a) Theta

(b) Rho

(c) Pi

(d) Chi

The question was posed to me during an interview.

My doubt stems from Secure Hash Algorithms (SHA) in chapter Other Public Key Cryptosystems and Cryptographic Hash Functions of Cryptograph & Network Security

1 Answer

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Right answer is (a) Theta

For explanation: The above operation represents the theta step function.

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