For those interested in learning more, Simon Singh's "The Code Book: The Science of Secrecy from Ancient Egypt to Quantum Cryptography"[1] has a great chapter e

For those interested in learning more, Simon Singh's "The Code Book: The Science of Secrecy from Ancient Egypt to Quantum Cryptography"[1] has a great chapter explaining in detail the creative breakthroughs that allowed Turing to break the Enigma machine when it was stumping pretty much everyone else at Bletchley Park. -- [1] http://www.amazon.com/Code-Book/dp/0385495323 http://www.amazon.com/Code-Book/dp/0385495323