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Collins Gem Codes & Ciphers: Making Them and Breaking Them
Covering the history of the development of codes and ciphers, this book also includes practical information and advice on how to make codes and how to break them. It touches on everything from the smoke signals used by Native American Indians to encryption devices used by government agencies and the military.
Paperback, 192 pages
Published August 7th 2006 by HarperCollins UK
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