Question: Information Security: Consider a Feistel cipher with four rounds. Then the plaintext is denoted as P = (Lo, Ro) and the corresponding ciphertext is C

Information Security: Consider a Feistel cipher with four rounds. Then the plaintext is denoted as P = (Lo, Ro) and the corresponding ciphertext is C = (L4, R4).What is the ciphertext C, in terms of Lo, Ro, and the subkey, for each of the following round functions?

a. F(Ri-1,Ki) =0

b. F(Ri-1,Ki) =Ri-1

c. F(Ri-1,Ki)= Ki

d. F(Ri-1,Ki) = Ri-1 XOR Ki

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