50 Codes that Changed the World

A CUNNING CHRONICLE OF THE 50 CODES THAT ALTERED THE COURSE OF HISTORY AND CHANGED THE WORLDFrom the bestselling author of Bletchley Park Brainteasers and The Scotland Yard Puzzle Book. There have been secret codes since before the Old Testament, and there were secret codes in the Old Testament too. Almost as soon as writing was invented, so too were the devious means to hide messages and keep the...