Tunny

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Tunny

German code device

Also known as: Schlüsselzusatz SZ40

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major reference

In Colossus
…that the British code-named “Tunny.” Tunny was the Schlüsselzusatz (SZ) cipher attachment, manufactured by Berlin engineering company C. Lorenz AG. Tunny sent its messages in binary code—packets of zeroes and ones resembling the binary code used inside present-day computers.
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Ultra intelligence project

In Ultra: Tunny
In 1940 the German Lorenz company produced a state-of-the-art 12-wheel cipher machine: the Schlüsselzusatz SZ40, code-named Tunny by the British. Only one operator was necessary—unlike Enigma, which typically involved three (a typist, a transcriber, and a radio operator). The Tunny operator simply typed in…
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