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Lorenz used the International Teleprinter Code, in which each letter of the alphabet was represented by a series of five electrical impulses. Extra letters were generated by the rotors and added to the original text. Five of the twelve rotors followed a regular pattern and two pinwheels dictated the pattern of the other five. To decrypt a message, the receiving Lorenz added the same obscuring letters.

Details

  • Title: Teleprinter Tape
  • Date: 1939/1945
  • Location: Bletchley Park
  • Rights: Crown Copyright. By kind permission Director GCHQ

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