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

Silly Brit

As I understand it, the Germans received a couple of hints that codes might have been cracked. At one point they went back and interviewed the polish codebreakers they captured who had cracked Enigma before the war but the poles were able to convince the Germans that changes in procedures meant the same cracking shortcuts they used were no longer possible.

On more than one occasion I think they reviewed the information they had and convinced themselves that it was still uncrackable , rather than erring on the side of caution as the allies often did.

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