Question: Let us consider a simple encryption system based on the Feistel's scheme illustrated in the figure opposite. If this system operates on blocks of 8

Let us consider a simple encryption system based on the Feistel's scheme illustrated in the figure opposite. If this system operates on blocks of 8 bits and uses the function f(b1b2b3b4)=b2b3bAb1.

1-Encrypt the plaintext message m=01011

2-Decrypt the cipher c= 01101011

Lo L = Ro f Ro R = Lof(Ro)

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