RPBook, 
The Polish Embassy in London has released a series of interviews with Marian Rejewski, the first person to crack the #Enigma code.
He explains the process, including how they did it before they invented the bomba, and how the bomba worked. Fascinating stuff.
https://www.youtube.com/playlist?list=PLpGkvbzPcKIkRFESgp-rn5wraRvJD-DEz#SecondWorldWar #histodons
@worldwarshistory @militaryhistory
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