Did the Masons hide messages in the street plan of Washington, D.C.' Does the Hebrew Bible conceal hidden mysteries? Ingenious methods for encrypting secrets have taken many amazing turns through the ages, from the military signals the Romans flashed from hilltop to hilltop to the computer codes that guard your cash at the ATM. Pierre Berloquin, one of France’s leading puzzle book authors, takes you on a tour of them all in a book full of astonishing historical insights. With more than 150 brain-teasing problems for readers to solve, this new paperback edition of Hidden Codes & Grand Designs goes deep into the how-to of codes, ciphers, and other secret communication systems.