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===Tunny and Colossus Galleries===
[[Image:ColossusRebuild 11.jpg|thumbnail|upright|A team led by [[Tony Sale]] reconstructed a [[Colossus computer|Colossus Mark 2 computer]] at Bletchley Park. Here, in 2006, Sale supervises the breaking of an enciphered message with the completed machine.]]
Separate from the Enigma story is the less well-known one of the [[Cryptanalysis of the Lorenz cipher|diagnosing and deciphering]] of messages produced by the more secure [[Lorenz cipher|12-rotor Lorenz SZ]] teleprinter cipher attachments, which is told in these two galleries.<ref>{{citation | editor-last = Copeland | editor-first = B. Jack | editor-link = Jack Copeland | title = Colossus: The Secrets of Bletchley Park's Codebreaking Computers | place = Oxford | publisher = Oxford University Press | year = 2006 | pages = 1-6 | isbn = 978-0-19-284055-4 }}</ref> The Tunny galley exhibits
'Tunny' was the name given to the messages, to the unseen machine and to the British-built emulator. The gallery shows the visitor a reproduction of part of the original Lorenz listening station from [[Knockholt]] in Kent, with its multiple [[RCA]] AR-88 radio receivers, [[Chart recorder|pen recorders]] (undulators) and the sort of [[paper tape]] and [[teleprinter]] equipment that was used to record the messages and transmit them to Bletchley Park. Also on display is a working replica of a British Tunny machine that exactly emulated the Lorenz machine and a working replica of the [[Heath Robinson (codebreaking machine)|Heath Robinson]] machine, the forerunner of [[Colossus computer|Colossus]].
The Colossus gallery houses the fully working rebuild of a Colossus Mark 2. During his work to save Bletchley Park, Tony Sale recognised the pioneering nature of the ten Colossus machines that had been designed and built during WW2 to assist in breaking messages enciphered by the Lorenz machines.<ref>{{citation | last = Sale | first = Tony | author-link = Tony Sale | title = The Colossus Computer 1943–1996 and how it helped to break the German Lorenz cipher in WWII | place = Cleobury Mortimer | publisher = M & M Baldwin | year = 2004 | origyear = 1998 | isbn = 0-947712-36-4 }} </ref> He and his team spent 14 years from 1993 in building this machine with its 2,420 [[Vacuum tube|valves]] (vacuum tubes) and its [[Computer program|programmability]] by switches and patch leads. It is a reproduction of what is arguably the world’s first programmable electronic computer.
There are a number of other other artefacts in this gallery.▼
===First Generation Gallery===
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