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

Stoneshop Silver badge
Boffin

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

R.V.Jones' Most Secret War refers to this dilemma: acting on information versus keeping the fact that the code was broken under wraps. In some cases where acting was the strongly preferred option because of the anticipated consequences of not acting, a 'thank you for the info' was sent to a (non-existent) agent who could have plausibly provided the pertinent info.

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