Question: 12. Consider a Feistel cipher with four rounds. Then the plaintext is denoted as P=(L0,R0) and the corresponding ciphertext is C=(L4,R4). What is the ciphertext

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

12. Consider a Feistel cipher with four rounds. Then the plaintext is denoted as P=(L0,R0) and the corresponding ciphertext is C=(L4,R4). What is the ciphertext C, in terms of L0,R0, and the subkey, for each of the following round functions? a. F(Ri1,Ki)=0 b. F(Ri1,Ki)=Ri1 c. F(Ri1,Ki)=Ki d. F(Ri1,Ki)=Ri1Ki

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