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Lorenz Cipher Machine

Lorenz Cipher Machine

C043/4619

Rights Managed

12.4 MB (1.9 MB compressed)

2400 x 1800 pixels

20.3 x 15.2 cm ⏐ 8.0 x 6.0 in (300dpi)

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Credit

SCIENCE SOURCE / SCIENCE PHOTO LIBRARY SCIENCE SOURCE / SCIENCE PHOTO LIBRARY

Caption

Lorenz cipher machine. The Lorenz SZ40, SZ42a and SZ42b were German rotor stream cipher machines used by the German Army during World War II. They were developed by C. Lorenz AG in Berlin. The model name SZ was derived from Schlussel-Zusatz, meaning cipher attachment. The instruments implemented a Vernam stream cipher. British cryptanalysts, who referred to encrypted German teleprinter traffic as Fish, dubbed the machine and its traffic Tunny (meaning tunafish) and deduced its logical structure three years before they saw a machine.

Release details

Model release not required. Property release not required.

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