Question: 5. (a) Given affine cipher En(x) = 11x + 14 mod 26, encrypt the message hello (b) decrypt the ciphertext goody to determine the plaintext.

 5. (a) Given affine cipher En(x) = 11x + 14 mod

5. (a) Given affine cipher En(x) = 11x + 14 mod 26, encrypt the message hello (b) decrypt the ciphertext goody to determine the plaintext. Note the plaintext is nonsensical english (c) In a one-time pad, if the key is 1001001 and the ciphertext is 0010011 then what is the plaintext. (d) suppose we apply a permutation of three items using (1,2,0). Determine the ciphertext when we encrypt the plaintext tophat (e) Suppose to encrypt we apply a substitution, permutation of three items and then a substitution (lets call this encryption SPS). The substitution is the affine cipher in (a) and the permutation is given by (1,2,0). Using SPS determine the ciphertext when we encrypt of the plaintext tophat

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