Question: Consider a Feistel cipher with four rounds. Then the plaintext is denoted as P = (L_0, R_0) and the corresponding ciphertext is C = (L_4,

Consider a Feistel cipher with four rounds. Then the plaintext is

Consider a Feistel cipher with four rounds. Then the plaintext is denoted as P = (L_0, R_0) and the corresponding ciphertext is C = (L_4, R_4). What is the ciphertext C, in terms of L_0, R_0, and the subkey, for each of the following round functions? a. F(R_i - 1, K_i) = 0 b. F(R_i - 1, K_i) = R_i - 1 c. F(R_i - 1, K_i) = K_i d. F(R_i - 1, K_i) = R_i - 1 K_i

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