Question: (5 pts) Consider a symmetric block encryption algorithm in which 64-bit blocks of plaintext are encrypted using a 128-bit key. The encryption function is defined

(5 pts) Consider a symmetric block encryption algorithm in which 64-bit

(5 pts) Consider a symmetric block encryption algorithm in which 64-bit blocks of plaintext are encrypted using a 128-bit key. The encryption function is defined by: C (M xor Ko) K1 mod 264, where C is the cyphertext, M plaintext, K- (Ko K1) secret key with left 64 bits Ko, and right 64 bits K1. Find the expression of the decryption function

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