Editing Rotor machine (section)

==Description==
The primary component of a rotor machine is a set of ''rotors'', also termed ''wheels'' or ''drums'', which are rotating disks with an array of [[electrical contact]]s on either side. The wiring between the contacts implements a fixed [[substitution alphabet|substitution]] of letters, replacing them in some complex fashion. On its own, this would offer little security; however, before or after encrypting each letter, the rotors advance positions, changing the substitution. By this means, a rotor machine produces a complex [[polyalphabetic substitution]] cipher, which changes with every key press.