I had not heard before about the Polish role in cracking the Enigma code. I guess all countries write the bits of history that suit them.https://twitter.com/HistDyplomacji/status/889736090676056064 …
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Rejewski and the others broke Enigma traffic with attacks on the message keying protocol. Germans changed that early in the war.
Turing's known-plaintext attack using elecro-mechanical "Bombes" was unrelated.
I say unrelated, but having a history of broken messages was important to making known-plaintext attack possible: it helped provide "cribs"
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