Engineering, 06.03.2020 23:54 webbjalia04

Suppose a random cryptosystem is obtained as follows. The message consists of two independent random variables X, Y both generated by spinning a wheel with arcs labeled 0 and 1, both of lengthes 1/2. Let there be four equiprobalbe keys with the following corresponding encrypting transformations:

K1: (X1, X2) --- > (X1, X2) k2: (X1, X2) --- > (X2, X1) k3: (X1, X2) --- > (X1, (X1+X2) mod 2) k4: (X1, X2) --- > ((X1+X2) mod 2, X1)

Calculate the entropy of the cyphertext.

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Suppose a random cryptosystem is obtained as follows. The message consists of two independent random...

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