22 Aug '17, 2pm
The Enigma Enigma: How The Enigma Machine Worked
As we said, each rotor is wired differently. They’re therefore given names using Roman numerals: I, II and III. But to further complicate things for anyone who might have such a machine and be trying to decrypt a message, the rotors are allowed to be moved around before use. Rotor II might be the left one, with rotor III in the middle and rotor I on the right. And to add even more possibilities, up to eight rotors were made altogether, each with their own wiring and Roman numerals: IV, V, VI, VII and VIII. The German Army and Air Force used five and the Navy used up to eight. Prior to use, for a three-rotor machine, three rotors would be selected from however many rotors were available to choose from.