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This article is about the decryption device used at Bletchley Park. For the earlier Polish decryption device, see Bomba (cryptography). For the European dessert called a bombe, see Bombe glacée.
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The bombe was an electromechanical device used by British cryptologists to help decipher German Enigma-machine-encrypted secret messages during World War II.<ref>{{#invoke:Footnotes|harvard_citation_no_bracket}}</ref> The US Navy<ref>{{#invoke:Footnotes|harvard_citation_no_bracket}}</ref> and US Army<ref>{{#invoke:Footnotes|harvard_citation_no_bracket}}</ref> later produced their own machines to the same functional specification, but engineered differently from each other and from the British Bombe.

The initial design of the bombe was produced in 1939 at the UK Government Code and Cypher School (GC&CS) at Bletchley Park by Alan Turing,<ref>{{#invoke:Footnotes|harvard_citation_no_bracket}}</ref> with an important refinement devised in 1940 by Gordon Welchman.<ref name=H6StoryP77>{{#invoke:Footnotes|harvard_citation_no_bracket}}</ref> The engineering design and construction was the work of Harold Keen of the British Tabulating Machine Company. It was a substantial development from a device that had been designed in 1938 in Poland at the Biuro Szyfrów (Cipher Bureau) by cryptologist Marian Rejewski, and known as the "cryptologic bomb" (Polish: bomba kryptologiczna{{#invoke:Category handler|main}}).

The bombe was designed to discover some of the daily settings of the Enigma machines on the various German military networks: specifically, the set of rotors in use and their positions in the machine; the rotor core start positions for the message—the message key—and one of the wirings of the plugboard.<ref>{{#invoke:Footnotes|harvard_citation_no_bracket}}</ref><ref>{{#invoke:Footnotes|harvard_citation_no_bracket}}</ref><ref>{{#invoke:Footnotes|harvard_citation_no_bracket}}</ref>

Bombe sections
Intro  The Enigma machine  The principle of the bombe  The British Bombe  Response to the Four-rotor Enigma  Bombe rebuild  See also  Notes  References  External links  

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