Codes, Ciphers and Secret Writing (Test Your Code Breaking Skills) free download online
Title: Codes, Ciphers and Secret Writing (Test Your Code Breaking Skills) Author(s): Martin Gardner Pages: 96 Publisher: Dover Publications Publication date: 1984 Language: English Format: PDF ISBN-10: 0486247619 ISBN-13: Description: 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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Title: Codes, Ciphers and Secret Writing (Test Your Code Breaking Skills)