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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!
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Book Description Scholastic, 2010. Paperback. Condition: New. Never used!. Seller Inventory # P111407114565
Book Description Scholastic, 2010. Condition: New. Mike Phillips (illustrator). book. Seller Inventory # M1407114565