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M and N Media
Everything from smoke signals to military encryption devices
"Codes and Ciphers" reveals the development and role of secret communications throughout history and offers practical advice on how to make codes (whether by pencil and paper or by computer) and how to break them
Inside you will find information on: Code-breaking devices Hieroglyphics, Native American smoke signals, flags, and semaphore Braille, Morse code, and computer language Mono- and polyalphabetic letter substitution Computer algorithms
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