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(a) Is the function E(m) = 6m + 7 (mod 26) a good candidate for an affine cipher? Justify your answer. (b) The ciphertext (21,

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(a) Is the function E(m) = 6m + 7 (mod 26) a good candidate for an affine cipher? Justify your answer. (b) The ciphertext (21, 16,5, 14) was encrypted using an affine cipher modulo 26. The first symbols of the plaintext are 2 and 11. Find the encryption function

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