Every day in the United States, professional cyber-spies are stealing tremendous amounts of information. Mainly from Russia and China, these spies target computer networks and increasingly seek entryways through mobile phones. Modern mobile phones -- Smartphones -- are powerful, networked computers, but they lack the firewalls and safeguards typically installed on PCs. What protection is commercially available is weak and unsatisfactory. America's cyber-systems are under attack because what they hold is extremely valuable. Everything from the design of a stealth fighter-bomber to the investment portfolio of a powerful entrepreneur is open to professional cyber-spies and, thus, to the governments that...