The Enigma was a Bletchly Park thing and kept quiet til after the war was over.
Enigma was the name of the German electromechanical encryption devices that Bletchly Park succeeded in cracking.
Once they had figured out how to crack the Enigma code (a process that was much aided by the fact that the Germans were very fond of rules, so stuff like weather reports would be transmitted at the same time each day from the same place using the same message headers), two types of machines, the Bombes and Colossus, were built to speed up the process of finding the decryption keys.
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