Lorenz cipher

The Lorenz cipher was a class of German rotor stream cipher machines used by the German Army during World War II. It was mostly used for messages among headquarters. This machine and its messages were eventually worked out by the team at Bletchley Park during World War II.

The Lorenz SZ42 machine with its covers removed. Bletchley Park museum

British cryptanalysts (codebreakers) worked out its logical structure three years before they saw the machine.[1][2]

References

Hinsley F.H. & Stripp, Alan eds. 1992, Codebreakers: The inside story of Bletchley Park. Oxford: Oxford University Press. ISBN 978-0-19-280132-6
Copeland, B. Jack, ed 2006. Colossus: the secrets of Bletchley Park's codebreaking computers. Oxford: Oxford University Press. ISBN 978-0-19-284055-4

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[1] Hinsley F.H. & Stripp, Alan eds. 1992, Codebreakers: The inside story of Bletchley Park. Oxford: Oxford University Press. ISBN 978-0-19-280132-6

[2] Copeland, B. Jack, ed 2006. Colossus: the secrets of Bletchley Park's codebreaking computers. Oxford: Oxford University Press. ISBN 978-0-19-284055-4