Enigma M4
Four-rotor naval Enigma
The naval four-rotor machine, with an extra thin Greek wheel beside a thin reflector.
19423 moving rotors + 1 settable Greek wheelMechanical model
Interactive 3D model
Tap a machine key, or focus the model and type A–Z. Inspect the mechanism to see the drive beneath the cover.
Explore the machine
Press the keys to see the three-wheel drive. Adjust the Greek wheel separately and inspect the compact rotor bank.
About this reconstruction
Survivor photographs guide the thin reflector, Greek wheel and naval fittings. The Greek wheel does not step during typing. This model demonstrates mechanics without computing cipher output; hidden dimensions are reconstructed.