Question: Consider a very simple symmetric block encryption algorithm, in which 32-bits blocks of plaintext are encrypted using a 64-bit key. Encryption is defined as C

Consider a very simple symmetric block encryption algorithm, in which 32-bits blocks of plaintext are encrypted using a 64-bit key. Encryption is defined as C = P XAND (Kl XOR Kr) where C = ciphertext; K = secret key; Kl = leftmost 32 bits of K; Kr = rightmost 32 bits of K; = bitwise exclusive or; and is addition mod 2^32. (a) Show the decryption equation. That is, show the equation for P as a function of C, Kl and Kr. (b) Suppose an adversary has access to two sets of plaintexts and their corresponding ciphertexts and wishes to determine K. Can s/he find Kl &Kr? If yes, go ahead and find; if no, explain why.

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