ciphers

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.

Elusive art thief Lars Heinrich returns to New York City looking to settle a score. Super sleuth seventh-grader Edmund Xavier Lonrrot will need not only his photographic mind and artistic talents, but any skill he possesses with cracking codes as a string of the city's historical monuments become potential clues in what could become one of the greatest heists in history.

"Teaches readers how to make secret codes and messages through clear steps, simple supply lists, and helpful tips and fun facts"-- Amazon.

When a mysterious letter written in code arrives at King's house for his human, Kayla, he follows the trail of the person who left it.

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.

When a mysterious letter written in code arrives at King's house for his human, Kayla, he follows the trail of the person who left it.

This intriguing and revelatory history of cryptology ranges from the early days of code-making and code-breaking to the present day.

After twelve-year-old Addison Cooke's uncle unearths ancient Incan secrets in Peru, he is kidnapped by a shadowy organization intent on stealing the treasure unless Addison and his friends can decipher the clues first.

Skilled code-cracker and detective Ruby Redfort has an adventure at sea in which she must crack the case of the Twinford pirates while avoiding a vile sea monster and the evil Count von Viscount.

Dr. One-Zero won't stop until the whole town--no, the whole world--embraces the "true happiness" found in his poisonous potion, Green Pop. And now that he has the Turtle of Light, he's virtually unstoppable. There's one weapon that can defeat him: another Turtle of Light. Unfortunately, they can only be found in another dimension! To open a portal to this new world, Hopper, Eni, and Josh's coding skills will be put to the test.