Dimensions
140 x 210 x 6mm
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.
