This cipher system was used to create encrypted Nazi messages during WWII.

The volunteer very happily paid 10 GBP for the keyboard and went on his way.

To crack the code, code-breakers had to figure out the starting position of the rotors.

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The code was first broken after the Germans made a mistake, sending two messages using the same setting.

Only four are known to have survived.

The existence of the machines remained a secret until the 70s.

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However, a motor that powers the machine is still missing.

Volunteers hope the public will look out for it.

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source: www.techworm.net