Download Codes, Ciphers and Secret Writing by Martin Gardner (.PDF)

Codes, Ciphers and Secret Writing by Martin Gardner
Requirements: PDF Reader, 2.3 mb
Overview: Learn to use the most important codes and methods of secret communication in use since ancient times. Cipher and decipher codes used by spies. Explore the famous codes that changed the fate of nations and political leaders. And enjoy hours of fun. Experiment with cryptography — the science of secret writing. Cipher and decipher codes: transposition and polyalphabetical ciphers, famous codes, typewriter and telephone codes, codes that use playing cards, knots, and swizzle sticks…even invisible writing and sending messages through outer space. Hours of intrigue and challenge. 45 diagrams.
Genre: Nonfiction > Children’s Books

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