Cracking codes / Diana Kimpton ; illustrated by Mike Phillips.

London : Hippo, 2003.

158 p. : ill. ; 20 cm.

First the ancient Greeks hid messages under their hair. Now computers create codes no human can crack. This revealing guide gives you the key to unlock the secret languages of spies. Get on the case to discover how to decipher dots and dashes, fathom flags, and suss a simple cipher.

9780439981842 (pbk)

J793.7

English

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