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A type of monoalphabetic substitution cipher, wherein each letter in an alphabet is mapped to its numeric equivalent, encrypted using a simple function `(ax + b) mod m`.

4 votes
1 answer
767 views

Affine cipher and plaintext attacks, how to find the base modulo?

Last year, a question concerning plaintext attacks was posted at Mathematics.SE: “Plaintext attacks: affine cipher”. I have no problem to see how to solve it when we are given two ciphertexts and $(c_ …
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