Lorenz SZ42 “Tunny” code machine

Lorenz SZ42 "Tunny" code machine

The German SZ42 Schlüsselzusatz, or cipher attachment, was developed by the Germans in 1942 for use by the German Army. The British nicknamed it “Tunny,” after a type of tuna. This seemingly random name was due to the requirement to call all German encrypted traffic “fish,” as a security measure.

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The German SZ42 Schlüsselzusatz, or cipher attachment, was developed by the Germans in 1942 for use by the German Army. The British nicknamed it “Tunny,” after a type of tuna. This seemingly random name was due to the requirement to call all German encrypted traffic “fish,” as a security measure.

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