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Which among the following is not a substitution operation?

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in Cryptograph & Network Security by (60.1k points)
Which among the following is not a substitution operation?

(a) Theta

(b) Iota

(c) Pi

(d) Chi

This question was posed to me in my homework.

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

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The correct answer is (c) Pi

Explanation: Pi and Rho are permutation operations.

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