Secure communications is a vital need of the world, and basic features quantum mechanics seemingly offer fundamental new tools for achieving this security. But do these really work? This review gives due attention to real-world problems with experimental cryptography, but heart an in-depth survey analyses developed prove security techniques introduced by Wiesner, Ekert, Bennett, Brassard. A bro...

Ever since its inception, cryptography has been caught in a vicious circle: Cryptographers keep inventing methods to hide information, and cryptanalysts break them, prompting cryptographers invent even more sophisticated encryption schemes, so on. But could it be that quantum information technology breaks this circle? At first sight, looks as if just lifts the competition between next level. In...