"The author\'s upbeat, positive tone is refreshing and his enthusiasm about his topic is contagious." -- SCHOOL LIBRARY JOURNAL (starred review) PssstDo you know the difference between a code and a cipher? Can you tell a St.
Janeczko\'s tantalizing TOP Secret won\'t stay a Secret for long..
Offering plenty of hands-on practice sessions, tips for creating a code-making kit, sidebars on Secret Codes in history, and an amusing pair of spies to illustrate techniques, Paul B.
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? Don\'t look now, but packed into this practical field guide is everything a young person needs to know about the art of concealment - making and breaking codes, mastering cipher systems, and experimenting with Secret writing. "The author\'s upbeat, positive tone is refreshing and his enthusiasm about his topic is contagious." -- SCHOOL LIBRARY JOURNAL (starred review) PssstDo you know the difference between a code and a cipher? Can you tell a St
