BookOpen AccessMetadata saja
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!