cryptography

"Cryptography is a powerful tool that's been used throughout history--for good and for bad. Learn to make and break the same ciphers used by monarchs, spies, and soldiers. Then put your knowledge to the test by creating your own secret messages for friends and family"--Back cover.

Describes different techniques used in secret writing, and explains how to make and break six kinds of codes. Includes over fifty practice messages, a glossary, a sheet of reproducible graph paper, and a page of ready-made alphabets.

Battle-hardened World War II sergeant Joe Enders tries to maintain a professional distance when he is assigned to, protect Ben Yahzee, a young recruit fluent in the so-far unbreakable battlefield code based on the Navajo language--mindful of the unspoken order to kill Ben rather than let him be captured by the Japanese.

Amy and Dan, members of the powerful Cahill family, try to uncover the thirty-nine clues which will reveal the secrets of their lineage and find out what really happened to their parents.

Photographs, illustrations, and text describe how math was used to decipher coded messages throughout history.

Looks at the history of code making and breaking, from Champollion deciphering Egyptian heiroglyphs to the German Enigma machine.

Describes the heroic efforts of the American Indian soldiers known as Code Talkers who served during World Wars I and II.

"When the Code Busters visit the Carmel Mission, a series of coded messages sets them on the hunt for long hidden pirate treasure"--Provided by publisher.

A history of ciphers and cryptography that features stories of hidden treasures, war-time maneuverings, and contemporary hacking, and describes the mechanics behind the codes.

"A nonfiction chronicle of the courageous efforts of remarkable young women recruited by the US government to crack German and Japanese military codes during World War II."--Provided by publisher.