Fun With Secret Writing (Dover Children'S Activity Books)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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Fun With Secret Writing (Dover Children'S Activity Books)