Obama brings tech firms into his cybersecurity push

President Barack Obama is asking Silicon Valley to join his plan to boost cybersecurity, as he takes new measures to improve sharing of threat information in the absence of legislation. A new executive order -- to be signed at a White House cybersecurity summit Friday in California -- aims to encourage better and faster sharing of threats between the private sector and government. The summit comes amid increased concerns over cybersecurity following a major intrusion last year into the network o