Publisher's Synopsis
Did the Masons encode messages in the street plan of Washington, D.C.? Does the Hebrew Bible conceal hidden mysteries? Ingenious methods for encoding 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 cash at the ATM. Pierre Berloquin, one of France?s leading puzzle book authors, takes readers 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 journey goes deep into the how-to of codes, ciphers and other secret communication systems.
