Question: 2 . Consider a very simple symmetric block encryption algorithm, in which 6 4 - bits blocks of plaintext are encrypted using a 1 2

2. Consider a very simple symmetric block encryption algorithm, in which 64-bits blocks of plaintext are encrypted using a 128-bit key. Encryption is defined as
C=(PK0) K1
where = ciphertext; = secret key; 0= leftmost 64 bits of ; 1= rightmost
64 bits of K,= bitwise Exclusive-Or; and is addition mod 264. Show the decryption
equation. That is, show the equation for as a function of ,0 and 1.

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