Top Secret: A Handbook of Codes, Ciphers, and Secret Writing
Pssst! Inside these TOP SECRET files is everything sneaky young agents need to know about making-and breaking-their own secret codes.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 a substitution cipher caused Mary Queen of Scots to lose her head? Donât look now, but packed into this practical field guide is everything...
By Paul B. Janeczko
Library Binding: 136 pages
Publisher: Paw Prints; Reprint edition (October 15, 2008)
Package Dimensions: 8.8 x 6.9 x 0.7 inches
Format: PDF ePub TXT book
Great book for 9-11 year olds who are into secrets. Some history. Some mystery and lots of easy codes they will enjoy. I wrote one down so I could send letters to a grandson in code. Has formulas for invisible ink etc....
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