1. An affine cipher using an alphabet of size n maps the letters to integers from 0 to n-1 This integer is the mapped to an integer representing a ciphertext letter. The encryption function, E(x) (axb) mod n. The key (a,b) are co-prime. If a middle man (MM) intercepts the cipher and finds out that the most frequent letter of the ciphertext is “M” and the second most common is “G”.
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