Shows how symbols are used for whole words and letters. Also includes methods for making invisible ink. Examples of cryptic messages from Caesar's day to the discovery of the Rosetta Stone are also given.

Presents a guide to codemaking, codebreaking, and their role in history, describing different types of codes and ciphers, discussing codebreaking and concealment techniques, and including brief stories about exciting moments in the history of the art.

Presents instructions for speaking thirteen secret languages, including Pig Latin, one of the best known and easiest codes to learn, and Boontling, developed by people in a California town.

"Communicate in a language only you and your friends can understand! Protect your diary from snooping siblings. Share your secrets with a BFF. Guard your texts from unwanted eyes. Create the lingua franca for your own fantastical secret world! Expert language creator David J. Peterson (inventor of languages for Game of Thrones, the Marvel Universe, and more) guides you as you create your own secret languages, codes, ciphers, and hidden messages. From...

Secret Codes and Ciphers.

Liz the Whiz and her younger brother use codes, a chart, and a map of the backyard that matches a clock face to solve Zack's mystery. Includes a section with related activities.

A study of the mystery of the Voynich Manuscript, discovered in 1912, examines the theory that thirteenth-century astronomer Roger Bacon was the author of the book, which is written in an indecipherable language and code that remains unsolved.

Trying to solve coded messages leads the Critter Kids to a new member for their club.