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Bletchley Park WWII Code-breaking Machines Rebuilt from Memories

Early 1940: British police listening for radio transmissions from German spies within the UK pick up weird signals, and pass them to Bletchley Park, the United Kingdom's main decryption establishment in WWII. The source of these German messages is an unknown machine, which the Brits dub Tunny (10 minute video with Tony Sale describing the Tunny). August 30, 1941: German operators send two very similar messages with the same key, providing insight into the encryption scheme. By January 1942, British cryptographers deduced the workings of the German code machines, sight unseen. The British were able to create their own Tunny emulators to decrypt messages sent by German High Command. After the war, these and other British code-breaking and emulating machines were demolished and/or recycled for parts and their blueprints destroyed, leaving a hole in the history of the British WWII code breaking. Efforts to rebuild the British Tunny emulator started in the 1990s, and quite recently a Tunny emulator replica was completed. [more inside]
posted by filthy light thief on May 30, 2011 - 12 comments

An introduction to Bletchley Park

Bletchley Park: A WWII juggernaut. It decrypted German Enigma (try one!) and Japanese messages on an industrial scale in huts and blocks, had an outpost in Mombasa, and built one of the first modern computers (it helped that Alan Turing was on staff). Now a diverse museum with or without a funding problem, it generated yet more intrigue in 2000 when an Enigma was stolen, and hosts a rebuilt, working Colossus that launched a cipher challenge. Beating it wasn't easy! [more inside]
posted by jwells on Jun 5, 2008 - 36 comments

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