Explains in simple terms how to encode and decode messages in various ciphers, describes coding machines, and gives formulas for invisible ink

Learn the Pinhole code, the Inside-out code, the Mixed-up math code, the Pigpen code, and more

Examines the history of writing and provides instructions for making special inks, using various alphabets and codes, and creating personal seals and private letter drops

"A hands-on guide to introduce kids to the fascinating world of secret codes and ciphers, CODE CRACKING FOR KIDS explores many aspects of cryptology, including famous people who used and invented codes and ciphers, such as Julius Caesar and Thomas Jefferson; codes used during wars, including the Enigma machine, whose cracking helped the Allies gather critical information on German intelligence in World War II; and work currently being done by the...

In this picture book biography, young readers will learn all about Elizebeth Friedman (1892-1980), a brilliant American code breaker who smashed Nazi spy rings, took down gangsters, and created the CIA's first cryptology unit. Her story came to light when her secret papers were finally declassified in 2015. From thwarting notorious rumrunners with only paper and pencil to "counter-spying into the minds and activities of" Nazis, Elizebeth held a pivotal...

Discusses the establishment of the Marine Corps unit made up of Navajo Indians who served as radio operators, using their own language as a secret code, during World War II

"Codes can carry big secrets! Throughout history, lots of good guys and lots of bad guys have used codes to keep their messages under wraps. This fun and flippable nonfiction features stories of hidden treasures, war-time maneuverings, and contemporary hacking as well as explaining the mechanics behind the codes in accessible and kid friendly forms. Sidebars call out activities that invite the reader to try their own hand at cracking and crafting...

"A nonfiction manuscript for young readers about a group of Allied spies and codebreakers that cracked the Nazis's infamous cypher, allowing them to read secret military messages and turn the tide of World War II. During WWII, as the Germans waged war, every Nazi plan, every attack, was sent over radio. But to the Allies listening in, the messages sounded like gibberish. The communications were encoded with a powerful cypher-unless you could unlock...

""You are to report to Station X at Bletchley Park, Buckinghamshire, in four days time....That is all you need to know." This was the terse telegram hundreds of young women throughout the British Isles received in the spring of 1941, as World War II raged. As they arrived at Station X, a sprawling mansion in a state of disrepair surrounded by Spartan-looking huts with little chimneys coughing out thick smoke-these young people had no idea what kind...

"Through Thomas H. Begay's singular story, this richly illustrated biography for young readers describes aspects of Navajo history and culture and shows how a select group of Navajo soldiers used their native Diné language to invent and operate a secret communications system that was crucial to a US victory in the Pacific during World War II"--