Question: 3. (20 pts) Consider a Feistel cipher with four rounds. The plaintext PLo, Ro) and the ciphertext is C(L, R4). What is the ciphertext C,

3. (20 pts) Consider a Feistel cipher with four rounds. The

3. (20 pts) Consider a Feistel cipher with four rounds. The plaintext PLo, Ro) and the ciphertext is C(L, R4). What is the ciphertext C, in terms of Lo, Ro, and the subkey, for each of the following round functions? (a) F(R-1, K)0 (b) F(R,-1, K R-1 (c) F(R-1, K) K (d) F(R-1, Ki-R-1

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