Codes, Ciphers, and Secret Writing. (edit title)

Shelfari edited the description of Codes, Ciphers, and Secret Writing. Monday, August 10 2009.

• 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.

Shelfari edited the contributors of Codes, Ciphers, and Secret Writing. Saturday, July 25 2009.

• Added a contributor: Martin Gardner: (Primary Author)