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The previous 3-rotor Enigma model had been modified with the old reflector replaced by a thin rotor and a new thin reflector. Breaking Shark on 3-rotor bombes would have taken 50 to 100 times as long as an average Air Force or Army message. It seemed, therefore, that effective, fast, 4-rotor bombes were the only way forward.
A series of three rotors from an Enigma machine, used by Germany during World War II Exploded view of an Enigma machine rotor:1-Notched ring, 2-Dot marking the position of the "A" contact, 3-Alphabet "tyre" or ring, 4-Electrical plate contacts, 5-Wire connections, 6-Spring-loaded pin contacts, 7-Spring-loaded ring adjustment pin, 8-Hub, through which fits the central axle, 9-Finger wheel, 10 ...
A rare 8-rotor printing Enigma model H (1929) There was also a large, eight-rotor printing model, the Enigma H, called Enigma II by the Reichswehr. In 1933 the Polish Cipher Bureau detected that it was in use for high-level military communication, but it was soon withdrawn, as it was unreliable and jammed frequently. [48]
The Enigma-M4 key machine Key manual of the Kriegsmarine "Der Schlüssel M".. The Enigma-M4 (also called Schlüssel M, more precisely Schlüssel M Form M4) is a rotor key machine that was used for encrypted communication by the German Kriegsmarine during World War II from October 1941.
Despite the introduction of the 4-rotor Enigma for Atlantic U-boats, the analysis of traffic enciphered with the 3-rotor Enigma proved of immense value to the Allied navies. Banburismus was used until July 1943, when it became more efficient to use the many more bombes that had become available.
The Schlüsselgerät 39 (SG-39) was an electrically operated rotor cipher machine, invented by the German Fritz Menzer during World War II. The device was the evolution of the Enigma rotors coupled with three Hagelin pin wheels to provide variable stepping of the rotors. All three wheels stepped once with each encipherment.
Koch filed for his rotor machine patent on 7 October 1919, and was granted Netherlands patent 10,700 (equivalent to U.S. patent 1,533,252), held by Naamloze Vennootschap Ingenieursbureau Securitas in Amsterdam. No machine was built from his patents, and, in 1927, he assigned the rights to Arthur Scherbius, the inventor of the Enigma machine ...
NEMA uses 10 wheels, of which four are normal electrical rotors with 26 contacts at each end that are scramble wired in a way unique to each rotor type; one is an electrical reflector (like the Enigma's Umkehrwalze) with one set of 26 pairwise cross connected contacts; and the remaining five are "drive wheels", with mechanical cams that control the stepping of the rotors and the reflector.
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