Lorenz encryption machine

Lorenz encryption machine

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Credit: JAMES KING-HOLMES/BLETCHLEY PARK TRUST/SCIENCE PHOTO LIBRARY

Caption: Lorenz encryption machine, a German electromechanical device used in World War 2 to encrypt teleprinter messages. It combined the true message with a stream of obscuring characters. The cipher was broken when the Allies deduced that the mechanism generating the obscuring characters did not produce truly random output. It was possible to reconstruct the workings of the machine and decrypt messages using Colossus, a forerunner of electronic computers. Messages were deciphered by the Allies at Bletchley Park, England, where this machine is now housed.

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