Enigma M3: Naval Cipher

The Navy did not trust the Army's machine, and it was right not to. The Enigma M3 takes the same three-rotor frame and hands its operators a larger box: rotors VI, VII and VIII, which the Army never carried. Three slots, eight wheels to choose from, and rotors VI–VIII carry two turnover notches each rather than one — a small change that multiplies the number of possible keys and made the naval traffic markedly harder to read than the Army's. M3 is a working reconstruction. Press a key and the rotors step, the current runs out through the plugboard, through the wheels, into the reflector and back by a different path, and a lamp lights. Historical wiring, historical notches, historical stepping. Encipher a signal, wind back to the same ground setting, type the ciphertext, and the original returns — the machine is its own inverse, exactly as it was. TYPE STRAIGHT INTO ANY APP The Enigma…