1. Encryption of WWII Philip Gebhardt 10/24/2011

2. Interest

4. The Possibilities… (plug-board) * (selection of rotors) * (arrangement of rotors) * (starting position of each rotor) * (notch setting of each rotor) * (reflector configuration) = …

5. The Possibilities…

6. Purpose

7. Polish mathematical analysis in 1932 Used analysis of cycles of letter transformations Alan Turing’s “Bombe” machine in 1939-40 The U-Boat Enigma, Lorenz, and the Colossus Tommy Flowers The world’s first programmable computer

8. Some Interesting Sources How Polish Mathematicians Deciphered the Enigma: Marian Rejewski, Polish Cipher Bureau (1932-39) Test-driven development of an Enigma Simulator http://tdd-deciphered.com/