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Crypto :how the code-rebels beat the government, saving privacy in the digital age
Published 2001.
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Pass it on! : all about notes, from secret codes and special inks to fancy folds and dead man's drops
Published c1995.
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Secret messages : concealment, codes, and other types of ingenious communication
Published c2001.
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The code book how to make it, break it, hack it, crack it
Published 2002, c2001.
Go to Downloadable eBook Here.
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Secret warriors : the spies, scientists and code breakers of World War I
Published 2015.
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