Army M3 and naval M4
Switch between the familiar three-rotor machine and the four-wheel naval configuration.
M3 · M4 · OFFLINE
A working World War II rotor cipher, in your pocket.
Pocket Enigma is a tactile educational simulator for exploring the wheels, wiring, and daily settings behind history’s best-known cipher machine.
- Models
- M3 & M4
- Rotors
- I–VIII
- Network
- None
LIVE SIGNAL Rotors step before each letter
INSIDE THE MACHINE
From garbled nonsense to cleartext.
Set the complete daily key
Choose rotors, window letters, ring settings, reflector, and up to ten plugboard pairs.
Follow every signal
Inspect the electrical path through the plugboard, rotors, reflector, and return journey.
ONE KEY, BOTH DIRECTIONS
Explain the electrical circuit for each press.
Press a key, watch the right-hand rotor advance, see the output lamp glow, then open the signal trace to follow the complete round trip.
KEY R→PLUGBOARD→ROTORS→REFLECTOR B→LAMP V
PRIVATE BY DESIGN
Your messages stay on your device.
No account, analytics, advertising, tracking, or network connection.