Top Secret A Handbook Of Codes Ciphers And Secret Writing

The authors upbeat positive tone is refreshing and his enthusiasm about his topic is contagious. School Library Journal starred review Pssst Do you know the difference between a code and a cipher Can you tell a St. Cyr slide from a Cardano grille Did you know that the discovery of a substitution cipher caused Mary Queen of Scots to lose her head Dont look now but packed into this practical field guide is everything a young person needs to know about the art of concealment making and breaki