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An exclusive peek behind the scenes at Bletchley Park
By Andy McCue
Published: 18 March 2008 12:00 GMT
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The Lorenz machine pictured here had 12 pinwheels and each message sent by it was enciphered using a different starting position for each wheel.
Codebreakers at Bletchley Park found the code was not completely random and that the correct wheel starting positions could be found by analysing the messages at high speed.
Colossus' main task was discovering the pin patterns for all 12 wheels. It could then be used to work out the starting wheel settings for the enciphered messages.
Photo Credit: Andy McCue
See more photos from Colossus here…
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