Codes, Ciphers and Secret Writing

ISBN: 9780486247618

出版社: Dover Publications

出版年: 1984-10-01

页数: 96

定价: GBP 5.99

装帧: Paperback

内容简介

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.