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Simon Signh

Hay Festival 2005 , 
The author of The Cracking Code Book looks at secret codes from Ancient Rome toi the Internet. How do you make codes and how do you break them? How can you protect your diary from prying eyes and how can you sneak a peak at someone else's emails? Simon will have a genuine German World War II Enigma code machine to show how secret codes changed history.
(Age 10+)