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This illustrated encyclopedia surveys the history and development of code-making and code-breaking in all areas of culture and society from hieroglyphs and runes to DNA, the Zodiac Killer, graffiti, and beyond.

BradyGames Secret Codes 2001 Pocket Guide is a massive collection of the best cheats, tricks and secret codes for the hottest games from the PlayStation, PlayStation 2, Sega Dreamcast, Nintendo 64 and Game Boy consoles. No more endless searching on the internet for cheats -- they're all right here in an easy-to-use format.

BradyGames' Secret Codes 2003is an updated collection of the best cheats, codes, and tips for the most popular and newest games released for the next generation systems. Game secrets provided for the hottest new games including Tony Hawk's Pro Skater 4, Mat Hoffman's Pro BMX 2, The Mark of Kri, MLB Slugfest 20-03, NFL Blitz 20-03, Enclave, Beach Spikers,and more! Strategies for accessing secret characters, level passwords, extra lives, hidden menus, invincibility, and more! Secret codes and cheats give gamers the edge needed to make the most of their games and increase replay value.

Game Boy Advance Secret Codes will be the only pocket guide compilation of hundreds of codes and cheats available for the Game Boy Advance. Secret Codes and cheats are a "must have" for gamers and add replay value to the games purchased for their systems.

Code-cracking skills can be put to the test in this entertaining book which teaches children how to write and decode secret messages. Includes Semaphore and Morse code, the Grid code used in the American Civil War, Egyptian hieroglyphics, number replacement and alphabet switching codes and more. Each page features a different type of code, with an explanation of how it works and a practice code to crack. All answers are available at the back of the book.

"As gripping as a good thriller." --The Washington Post Unpack the science of secrecy and discover the methods behind cryptography--the encoding and decoding of information--in this clear and easy-to-understand young adult adaptation of the national bestseller that's perfect for this age of WikiLeaks, the Sony hack, and other events that reveal the extent to which our technology is never quite as secure as we want to believe. Coders and codebreakers alike will be fascinated by history's most mesmerizing stories of intrigue and cunning--from Julius Caesar and his Caeser cipher to the Allies' use of the Enigma machine to decode German messages during World War II. Accessible, compelling, and timely, The Code Book is sure to make readers see the past--and the future--in a whole new way. "Singh's power of explaining complex ideas is as dazzling as ever." --The Guardian

Game Boy® Secret Codes 3 Pocket Guide is the latest edition to the best cheats, tricks and secret codes for the hottest and most popular games released for Game Boy® and the new Game Boy® Advance. Codes and cheats top the list of what gamers want most. They have become a "must have" in gaming and help players uncover hundreds of secret codes and tricks.