Obama urges executives to cooperate more against cyber attacks

By Jeff Mason and Joseph Menn PALO ALTO, Calif. (Reuters) - President Barack Obama asked U.S. executives on Friday for closer cooperation in defending against hackers after high-profile attacks on companies like Sony that exposed weaknesses in America's cyber defences. Speaking at Stanford University, Obama told Silicon Valley and financial services CEOs that they needed to share more information more quickly both with each other and with his administration. Obama has moved cyber security t