Question

Let S1 be the cipher that shuffles on 8 elements with a key K1 given by: 1 2 3 4 5 6 7 8 5 8 1 3 2 7 6 4. Let S2 be the block cipher with M:

a. True
b. False

Answer 1

S2 cannot be solely constructed using S1. The answer is b. False.

How to solve

S1 shuffles elements in a specific order determined by the key K1. S2, a block cipher, operates on plaintext using specific transformations, typically involving substitution and permutation.

While S1 is a permutation cipher operating on a fixed number of elements, S2, being a block cipher, performs more complex operations like substitution and permutation over blocks of plaintext.

Therefore, S2 cannot be solely constructed using S1. The answer is b. False.

The Complete Question

Consider two ciphers: S1, a permutation cipher that shuffles 8 elements using a key K1: 1 2 3 4 5 6 7 8 5 8 1 3 2 7 6 4; and S2, a block cipher with plaintext M. Determine whether S2 can be constructed using S1.

a. True

b. False