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
They called the intelligence Ultra, like “ultra secret”, above even “top secret”.
https://en.wikipedia.org/wiki/Ultra_(cryptography)
It wasn’t allowed to be left unattended. Once read by officers in the field, it was burned. The entire programme was secret.
The rest of the operation relied on deception… fake spies, sending planes to “scout” areas the Allies already knew about from Enigma before attacking, turning Nazi spies and using them to report back.
While collecting the intelligence relied mostly on mathematicians and computer scientists, “safe” use of the intelligence was mostly psychological operation.
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