Codes, Ciphers and Secret Writing (Test Your Code Breaking Skills). Martin Gardner

Codes, Ciphers and Secret Writing (Test Your Code Breaking Skills)



Download Codes, Ciphers and Secret Writing (Test Your Code Breaking Skills)



Codes, Ciphers and Secret Writing (Test Your Code Breaking Skills) Martin Gardner ebook
Details info: EPUB, PDF, MOBI, 96 pages, English
Size: 2.47 MB


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.

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