A video of a fantastic tour at Bletchley Park, home of the Second World War Code Breakers, showing the method of interception and deciphering of the first teleprinter signals in Lorenz code, and how the need to speed the process up resulted in the development of the world's first programmable electronic computer.
I would strongly recommend a visit to Bletchley Park, Milton Keynes, UK. Take a whole day if you can as there is a lot to see. All the staff, the tour and guide and displays were outstanding.
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