Fun with Secret Writing (Dover Children's Activity Books)
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About The Book

Fascinating | easy-to-understand book for would-be cryptanalysts of all ages teaches how to invent and decipher a host of codes and secret messages | including the Moving Ahead cipher used by Julius Caesar; dots and pinpricks | as used by the secret Rosicrucian society; and even a system used by Sherlock Holmes. 14 black-and-white illustrations.
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