The Nazi's Enigma Machine and the mathematics behind it was a crucial part of World War II. Flaw video at:    • Flaw in the Enigma Code  Numberphile  
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Dr James Grime demonstrates the machine and discusses its many configurations.

James' "day job" is touring with the Enigma machine he could even visit you see more at http://enigma.maths.org/content/proje...

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