505122
9781588109408
Open this book to learn about ciphers and codes -- the tools used to keep a message secret. See how ciphers were used by the patriots in the American Revolutionary War. Find out how to make your own cipher. In this book, you will: discover how flag signals and smoke signals work, see how computers use ciphers and codes today, find out how you can break a cipher without a key. Book jacket.Hossell, Karen Price is the author of 'Ciphers and Codes' with ISBN 9781588109408 and ISBN 1588109402.
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