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Enigma has been used in World War II for advanced encryption/decryption of messages. It was an electro-mechanical machine and looked like a typewriter. I wrote this simulator in Delphi/Java in 2001 for a High School project. Unfortunately, most of the comments are in German, but in doubt you can use any translation service and you will get the information you need. You can also send me an email.
When you open the simulator all three rotors will be in the position A A A.
Just enter the text "ABCD" using the graphical keyboard. The encrypted output is "DJNL". The position of the rotors is A A E. Move the position of the rotors back to A A A. Enter "DJNL". You will see the decrypted output "ABCD".
Find more information about the Enigma machine on Wikipedia: http://en.wikipedia.org/wiki/Enigma_machine