The Enigma machine used a cascade of rotating cipher wheels to produce a polyalphabetic substitution cipher with 15×1018 possible settings. Each keypress advances the rotors, altering the signal path through the scrambler.
Rotor SlowARotor MidARotor FastAKey Pressed—Lamp Output—OrderI II IIIRings01 01 01Stecker0 pairsPhase IDLEPress a key or click the keyboard to begin.
Signal path Contact active Notch position Contact pinSpace:pause R:reset A-Z:typeBksp:clear Enter:copy
space pause · r reset · a-z type · enter copy · bksp clear