The spectacular cyber attack on Sony Pictures and costly hacks of Target, Home Depot, Neiman Marcus, and databases containing sensitive data on millions of U.S. federal workers have shocked the nation. Despite a new urgency for the president, Congress, law enforcement, and corporate America to address the growing threat, the hacks keep coming—each one more pernicious than the last—from China, Russia, Iran, North Korea, the Middle East, and points unknown.