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Codes, Ciphers and Secret Writing

By Martin Gardner
eBook
$5.95
By Martin Gardner
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"A fascinating, challenging book." ― A.L.A. Booklist
Learn to use the most important codes and methods of secret communication in use since ancient times. Cipher and decipher codes used by spies. Explore the famous codes that changed the fate of nations and political leaders. And enjoy hours of fun experimenting with cryptography ― the science of secret writing.
Beginning with simple letter substitutions and transposition ciphers, world-famous science writer Martin Gardner explains how to br...

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