Presentation at University of West Florida's "lunch 'n learn" series, 8 September 2008

1. The Engima Cipher Dr. Vicki Schell Pensacola Junior College [email_address] 9 September 2008

3. Taxonomy of Cryptology

4. ACTIVITY #1: How many possible keys are there when you swap each letter of the alphabet with another letter? 26*25*24*23*22*21*20*19*18*17*16*15*14*13812*11*10*9*8*7*6*5*4*3*2*1 =26! = 400 000 000 000 000 000 000 000 000

5. 400 septillion keys 6.5 billion people in the world 31 million seconds in a year If everyone in the world checked one key per second, it would still take 2 billion years to check them all!

21. Bletchley House During World War II, codebreakers at Bletchley Park solved messages from a large number of Axis code and cipher systems, including the German Enigma machine. For this purpose, the Bletchley Park mansion was soon joined by a host of other buildings. The mansion's facade is an idiosyncratic mix of architectural styles.

35. How to Speak Crypto Code : whole words or phrases replaced by a letter or number Cipher : Individual letters are replaced with other letters or symbols Plaintext : normal English Ciphertext : coded English Cryptology : the art and science of making and breaking “secret codes” Crytography : making “secret codes” Cryptanalysis : breaking ‘secret codes”

36. http://www.bletchleypark.org/ Thanks to Mike Koss for permission to use his paper Engima machine Simon Singh. The Code Book - The Science of Secrecy from Ancient Egypt to Quantum Cryptography . ENGIMA Director: Michael Apted. Actors: Dougray Scott, Kate Winslet, Saffron Borrows, Jeremy Northam, Nikolaj Coster-Waldau.