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The Enigma machine was an electro-mechanical rotor cipher device used extensively by Nazi Germany to encrypt military communications before and during World War II. The machine scrambled plaintext messages through a series of rotating rotors and an electrical plugboard. The Allies' successful effort...
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Cryptogram is a historic puzzle type where a piece of text is encrypted using a simple substitution cipher, famously used by Edgar Allan Poe in the 1840s.
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