ciphers

Amy and Dan continue their search for the clues and cross oceans amid ruthless enemies and dangerous truths while following the trail of a famous aviator.

Discusses different methods for creating secret codes.

Discusses different code-breaking methods and how they have been used throughout history.

Geronimo investigates to see if the famous painting Mona Mousa holds a secret code.

Readers are challenged to decipher secret messages, coded diary entries, cryptic inscriptions, and mysterious symbols in an attempt to locate a hoarde of lost treasure from the ancient civilization of the Bilongi Islands.

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.

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.