It is a Schlusselzusatz 40 (SZ40), made by the German company Lorenz and was used by the German Army for high-level communications. "It provided on-line encryption and decryption of messages and was capable of handling large volumes of traffic at high speed," according to the National Cryptologic Museum. "The Tunny depended on wheels for its encryption/decryption, but unlike Enigma, it did not substitute letters, but instead encrypted elements of the electrically generated 'Baudot Code' used in normal telegraphic transmissions."
July 4, 2011 4:00 AM PDT
Photo by: Daniel Terdiman/CNET
| Caption by: Daniel Terdiman
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