How did they get over the catch-22 that if they used the information that Nazis could guess it came from breaking the code but if they didn’t use the information there was no point in having it.
EDIT. I tagged this as mathematics because the movie suggests the use of mathematics, but does not explain how you use mathematics to do it (it’s a movie!). I am wondering for example if they made a slight tweak to random search patterns so that they still looked random but “coincidentally” found what we already knew was there. It would be extremely hard to detect the difference between a genuinely random pattern and then almost genuinely random pattern.
In: Mathematics
It was super secret. Most of the Allies, even at the general level did not know about Enigma. There was also no axis spy network in the UK. They gave intelligence from enigma a new designation “ultra secret ” and then used a codename for that called Boniface.
MI6 created a fake master spy who supposedly ran a spy network across Germany and named him Boniface. Intelligence from cracking enigma was attributed to human intelligence from this network.
Not all the intelligence was directly actionable either, a lot of the most useful intelligence was hearing how little fuel and reinforcements the Axis had so knowing how hard they could push enemy forces.
But mostly the issue was that used correctly enigma is impossible to crack. Germany didn’t really consider it was possible. It wasn’t. It was only possible because of mistakes operators had made, and the capture of some working machines.
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