Lorenz cipher facts for kids

The Lorenz SZ42 machine with its covers removed. Bletchley Park museum
The Lorenz cipher was the German rotor stream cipher machines used by the German Army during World War II. This machine and its messages were eventually worked out by the team at Bletchley Park during World War II.
British cryptanalysts (codebreakers) worked out its logical structure three years before they saw the machine.
Images for kids
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A rebuilt British Tunny at The National Museum of Computing, Bletchley Park. It emulated the functions of the Lorenz SZ40/42, producing printed cleartext from ciphertext input.

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Lorenz cipher Facts for Kids. Kiddle Encyclopedia.