Editing Enigma machine (section)

==== M4 (1942) ====
{{See also|Cryptanalysis of the Enigma#M4 (German Navy 4-rotor Enigma)}}
A four-rotor Enigma was introduced by the Navy for U-boat traffic on 1 February 1942, called ''[[Cryptanalysis of the Enigma#M4 (German Navy 4-rotor Enigma)|M4]]'' (the network was known as ''Triton'', or ''Shark'' to the Allies). The extra rotor was fitted in the same space by splitting the reflector into a combination of a thin reflector and a thin fourth rotor.

<gallery mode="packed" heights="160">
File:Enigma-G.jpg|Enigma G, used by the ''[[Abwehr]]'', had four rotors, no plugboard, and multiple notches on the rotors.
File:Enigma-IMG 0484-black.jpg|The German-made Enigma-K used by the Swiss Army had three rotors and a reflector, but no plugboard. It had locally re-wired rotors and an additional lamp panel.
File:Four-rotor-enigma.jpg|An Enigma model T (Tirpitz), a modified commercial Enigma K manufactured for use by the Japanese
File:Enigma Decoder Machine.jpg|An Enigma machine in the UK's Imperial War Museum
File:Bundesarchiv Bild 101I-241-2173-06, Russland, Verschlüsselungsgerät Enigma.jpg|Enigma in use in Russia
File:Bundesarchiv Bild 146-2006-0188, Verschlüsselungsgerät "Enigma".jpg|Enigma in radio car of the 7th Panzer Div. staff, August 1941
</gallery>

[[File:CMoA Enigma Machine Exhibit in Georgia.JPG|thumb|A three-rotor Enigma machine on display at [[Mimms Museum of Technology and Art]] and its two additional rotors]]