Gem Codes And Ciphers



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Covering the history of the development of codes and ciphers this book also has practical information and advice on how to make codes and how to break them. Topics covered are: Native American smoke signals Masonic signals and semaphore; morse code Braille ASCII computer language; letter substitution - mono- and poly-alphabetic; and more.

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This product was added to our catalog on Wednesday 04 July, 2007.

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