Computer Science / CS 0633 · Atom · ~20 seconds
The Substitution Cipher
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A substitution cipher creates ciphertext by substituting plaintext characters, bits, or blocks with alternates — monoalphabetic when each letter maps one way throughout, polyalphabetic when the mapping shifts.
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A puzzle page's cryptogram is the monoalphabetic case, breakable for exactly that reason.
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One fixed mapping is one fixed weakness.