David Stanley, a member of the team at Bletchley Park, describes how the ‘Tunny’ emulator machine was used to decrypt high-level wartime German messages produced by the Lorenz SZ40 and SZ42 encryption units.
The ‘Colossus’ – the world's first programmable digital computer, a reconstruction of which can be seen at the National Museum of Computing at Bletchley Park – was used to work out the starting positions (equivalent to the initial settings on the Lorenz machine) and then the ‘Tunny’ emulator (the name ‘Tunny’ actually applied to the traffic), the machine demonstrated here, actually decrypted the messages and printed them out on a teleprinter.
This video was recorded at Bletchley Park, near Milton Keynes in England. Please help keep this historic location alive by making a donation at bletchleypark.org; and support the Museum by visiting tnmoc.org
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