The image on the right shows the earlier Enigma M3 (3-wheel This way, any messages that were received with a Of the previous day, whilst the other one was setup with the keyįor the new day. One Enigma would then be left with the settings Most U-boats even had two Enigma machines on board toĬope with different keys around the midnight switch-over point. ![]() Room, although in some cases it was carried out to theĬaptain's quarters, e.g. In the U-boats, the Enigma was usually located in the radio There were two different versions of the extra wheel, named Is placed at position A, the machine is backwards It does not move during encipherment and is not Wheel adds an additional stage to the encryption algorithm. – the Zusatzwalze – that was fitted between the UKW Of each wheel is available in a table below.īesides 3 additional wheels to choose from, the M4 had an extra wheel Unlike the Army however, the Navy choose to have letters (A-Z) on theĬircumference of each wheel, rather than numbers (01-26). Three of which were in the machine at any given time. Steckerbrett (plug board) that is located behindĨ different coding wheels, (marked I to VIII), It has three moving wired rotors, a fixed Which was already in use at the Wehrmacht (Army and Air Force). ![]() The design of the M4 is based on the Enigma I, It remained unbroken for nine months until new key sheets were captured. The M4 played a pivoting role in the Battle of the AtlanticĪnd was introduced unexpected on 2 February 1942,Ĭausing great upset with the allied codebreakers at It was intended as a more secure version of the Electromechanical cipher machine, developed
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