letter C: C = E([a, b], p) = (ap + b) mod 26 A basic requirement of any encryption algorithm is that it be one-to-one. That is, if p q, then E(k, p) E(k, q). Otherwise, decryption is impossible, ...
Takes a string as input, removes all non-letter characters, applies a caesar shift cipher of 3, and formats the output into blocks of 5 uppercase characters padded with Xs.
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