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The CHI step involves which of the following gate operations?

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The CHI step involves which of the following gate operations?

(a) AND and NAND

(b) AND and XOR

(c) XOR and NAND

(d) XOR and XNOR

The question was asked in my homework.

This intriguing question originated from Secure Hash Algorithms (SHA) topic in section Other Public Key Cryptosystems and Cryptographic Hash Functions of Cryptograph & Network Security

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Right choice is (b) AND and XOR

To explain: The CHI step uses the AND and XOR operation.

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