Useful freeware, open source apps, and tech sites blog for geeks. (grep??? Hey! What the heck is 
During WW2, the German army used the Enigma to encrypt their messages. The story of England's effort at Bletchley Park to crack the Enigma code has been made into a movie starring Kate Winslet. Another factoid is that computer science pioneer, Alan Turing, lead the effort on breaking the Enigma.
Neal Stephenson wrote Cryptonomicron, about this war effort. I really enjoyed that book.
Click here to use the Flash (SWF) implementation of the Enigma.
Click here for the background and how to use it.
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