These pages give an introduction to substitution ciphers and then go on to explain exactly how the Enigma machine worked and how it was used. Substitution ciphers and the principle of the Enigma with a detailed example illustrating how the Enigma enciphers letters. The components of the Enigma machine and its military adaptation with a further page specifying the exact rotor wirings and the reflectors of the Enigma. The military use of the Enigma and the problem facing those trying to break it. To begin the tour, please continue to Page 1.
Further pages are in preparation.