The Enigma was a machine used by the German military before and during World War II to encrypt messages. To encrypt (or encipher) a message means to change its form in such a way that it (ideally) becomes unintelligible to anyone besides the sender and...

The Enigma machine was a cipher machine used to encrypt and decrypt secret messages. More precisely, Enigma was a family of related electro-mechanical rotor machines, comprising a variety of different models. The Enigma was used commercially from the...