Everybody has probably heard of Turing, Enigma and code breaking at Bletchley Park.
Here is a story that was only declassified in 2006 which is why you may never have heard of it.
This a reprise of on old post of mine which I have updated because I wished to give some facts to a visitor who did not know them.
Worth a look as it is delivered by the man himself, in his own modest words. With humour.
An hours worth of a Academic video of a ‘by request’ lecture.
P.S. I suppose I should declare some knowledge about this. I worked on a similar procedure as a commercial classified project many, many years after all this, but before it was declassified.