Question

In the Theta step function, which is a substitution step, each bit value changes. Each bit is dependent on _________ other bits for its new value.

(a) 13

(b) 4

(c) 7

(d) 11

This question was posed to me in homework.

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

Answer 1

The correct choice is (d) 11

To elaborate: In the theta function each bit is dependent on 11 other bits.