I greatly prefer the two Numberphile videos for explaining the Enigma machines, they go into the maths of how many different options there was and the flaw that cracked it, https://www.youtube.com/watch?v=V4V2bpZlqx8 and https://www.youtube.com/watch?v=G2_Q9FoD-oQ
I greatly prefer the two Numberphile videos for explaining the Enigma machines, they go into the maths of how many different options there was and the flaw that cracked it, https://www.youtube.com/watch?v=V4V2bpZlqx8 and https://www.youtube.com/watch?v=G2_Q9FoD-oQ