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In WW2 thanks to the german confidence in the breaked Enigma, the allies had an obvious advantage over them.
What if either the english or the soviets were the ones using Enigma or machines of the like, and the german the breaker ?
How would it affect WW2 ?
PS : I don't think giving the US Enigma would work. being on the other side of the ocean. And giving it to the french wouldn't be really interesting, germany already won OTL in such a way only the neo nazi time traveller meddling theory can explain it.