Codebreaking device created at Bletchley Park (United Kingdom)
This article is about the decryption device used at Bletchley Park. For the earlier Polish decryption device, see Bomba (cryptography). For the European dessert of the same name, see Bombe glacée. For other uses, see Bombe (disambiguation).
A wartime picture of a Bletchley Park Bombe
The bombe (UK: /bɒmb/) was an electro-mechanical device used by British cryptologists to help decipher German Enigma-machine-encrypted secret messages during World War II.[1] The US Navy[2] and US Army[3] later produced their own machines to the same functional specification, albeit engineered differently both from each other and from Polish and British bombes.
The British bombe was developed from a device known as the "bomba" (Polish: bomba kryptologiczna), which had been designed in Poland at the Biuro Szyfrów (Cipher Bureau) by cryptologist Marian Rejewski, who had been breaking German Enigma messages for the previous seven years, using it and earlier machines. The initial design of the British bombe was produced in 1939 at the UK Government Code and Cypher School (GC&CS) at Bletchley Park by Alan Turing,[4] with an important refinement devised in 1940 by Gordon Welchman.[5] The engineering design and construction was the work of Harold Keen of the British Tabulating Machine Company. The first bombe, code-named Victory, was installed in March 1940[6] while the second version, Agnus Dei or Agnes, incorporating Welchman's new design, was working by August 1940.[7]
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.[8][9][10]
^Welchman 2005, pp. 138–145.
^Wilcox 2001, p. 33.
^Wenger 1945.
^Smith 2007, p. 60.
^Welchman 2005, p. 77.
^Fitzgerald, John; Larsen, Peter Gorm; Mukherjee, Paul; Plat, Nico; Verhoef, Marcel (6 December 2005). Validated Designs for Object-oriented Systems. ISBN 9781846281075.
^Simon Singh (26 January 2011). The Code Book: The Science of Secrecy from Ancient Egypt to Quantum Cryptography. ISBN 9780307787842.
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