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WWII Bombe operator Ruth Bourne: I'd never heard of Enigma until long after the war

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Did the Germans ever got clued up that their supposedly encrypted message system have been compromised?

Apparently their techies always believed that it was impossible.

Other people had their suspicions. That's why Doenitz - head of the Navy, including U-boats - changed the Naval Enigma in February 1942, from a 3-rotor to a 4-rotor machine, with the result that BP was unable to decrypt the crucial U-boat traffic for nearly a year afterwards.

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