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Cracking Codes

First the ancient Greeks hid messages under their hair. Then Mary Queen of Scots completely lost her head because of a cracked coe. Now computers create codes no human can crack. Totally Cracking Codes is the ultimate guide to unlocking the secret language of spies. Aspiring code-breakers can discover how to decipher dot and dashes, fathom flags, suss a simple cipher and much more!

Over the centuries people have created codes they hoped others would never crack - now computers can do this. This revealing guide gives you the key to unlock the secret languages of spies.