The flaw which allowed the Allies to break the Nazi Enigma code. First video explaining Enigma: http://youtu.be/G2_Q9FoD-oQ Extra footage: http://youtu.be/BdrrJ7qd4HA Brown papers on ebay: http://bit.ly/brownpapers Periodic Videos: http://www.youtube.com/periodicvideos This video features Dr James Grime discussing Enigma, the Bombe and Alan Turing. James' "day job" is touring with the Enigma machine - he could even visit you - see more at http://enigma.maths.org/content/project-officer The maths of breaking the Enigma by James Grime http://enigma.maths.org/content/sites/enigma.maths.org/files/maths.pdf Website: http://www.numberphile.com/ Numberphile on Facebook: http://www.facebook.com/numberphile Numberphile tweets: https://twitter.com/numberphile Google Plus: http://bit.ly/numberGplus Videos by Brady Haran A run-down of Brady's channels: http://periodicvideos.blogspot.co.uk/2012/06/here-are-my-channels.html