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Rotor machine

Class of electromechanical encryption devices, used widely from the 1920s to the 1970s A series of three rotors from an Enigma machine, used by Germany during World War II Exploded view of an Enigma machine rotor:1-Notched ring, 2-Dot marking the position of the "A" contact, 3-Alphabet "tyre" or ring, 4-Electrical plate contacts, 5-Wire connections, 6-Spring-loaded pin contacts, 7-Spring-loaded ring adjustment pin, 8-Hub, through which fits the central axle, 9-Finger wheel, 10-Ratchet mechanism In cryptography, a rotor machine is an electro-mechanical stream cipher device used for encrypting and decrypting messages.

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