Question: Problem 1: (5 points) Assume 3S-DES is a simplified version of DES similar to S-DES, but with 3 rounds instead of two. The following two

Problem 1: (5 points) Assume 3S-DES is a simplified version of DES similar to S-DES, but with 3 rounds instead of two. The following two statements represent the encryption and decryption using 3S-DES cipher. ciphertext = IP (fx3 ( SW (fx2 (SW (fki (IP (plaintext))))))) (1) plaintext = IP! (fki ( SW (fx2 (SW (fx3 (IP (ciphertext))))))) (2) Show that the decryption is the reverse of encryption. Hint: substitute equation (2) in (1). Show all your work (answer will not be accepted)

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