The notches on the flange protruding from the rotor can be “pushed” manually to set the starting position of the rotor. On the surface of the right side, there is a circle of 26 spring contacts, while on the surface of the left side there is a circle of 26 plate contacts. The top photograph shows the right side of the rotor. The bottom photograph shows the left side of a rotor when viewed in such a way that the letters on it are right-side up. The following figure shows the views of the two sides of a typical ENIGMA rotor. To understand the operation of ENIGMA, one must be familiar with its fundamental components, namely the rotors. The plugboard was a later addition to the machine to provide one more encryption step by associating pairs of letters. It consists of a typewriter, a set of lamps labeled with letters in front of the typewriter keys, a set of rotors (partially hidden by the cover) in front of the lamps, and a plugboard on the front vertical wall of the box. The ENIGMA machine, shown in the figure below with its cover closed, is a rotor crypto-machine.
#Electronic enigma simulator simulator
Weierud have edited and put available the document “Turing’s Treatise on Enigma” from the original documents in the National Archives.) This article deals with the development of a simulator of the ENIGMA machine. For technical details on the breaking of the code, the master himself is the source: on the world-wide web, R. Battle of Wits: The Complete Story of Codebreaking in World War II. The Hut Six Story: Breaking the Enigma Codes. New York: Academic Press, 1980, and the following books (to name a few): Welchman, G. A History of Computing in the Twentieth Century.
(The interested reader is referred to the book by Bauer, the chapter titled “The COLOSSUS” by B. It is beyond the scope of this article to recount the fascinating history of the codebreaking of ENIGMA.
#Electronic enigma simulator code
The machine is also famous because the British cryptographers at Bletchley Park, most notably Alan Mathison Turing, were able to crack the ENIGMA code (with substantial initial help from Polish mathematicians who had been given an ENIGMA machine). There were commercial and military versions of this machine, which is famous for having been used by the German armed forces (Wehrmacht, Kriegsmarine, and Luftwaffe) and by the intelligence service (Abwehr) during World War II. The ENIGMA enciphering/deciphering machine was patented in Holland in the fall of 1919 by Hugo Koch, who sold the patent to the German engineer Arthur Scherbius, who in turn filed for a patent in 1926 (US patent number 1,584,660). Part of the presentation and the figures are from Bauer, F.L., Decrypted Secrets, pp. NOTE: This article is adapted from Chapter 12 of my unpublished textbook Applied Algorithms and Data Structures.
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