President Barack Obama says the U.S. will respond to the Sony cyber-attack “proportionately” The FBI officially named North Korea today as the culprit behind the attack. Obama says he is sympathetic to Sony’s plight, but feels the corporation made a mistake in caving to hackers’ demands. Security analyst Ken Westin: “Instead of going on the offensive, I believe the better option is focus on defense”Economic sanctions would be the logical retaliatory measure, argues Michael Sutton, vice president of security research at Zscaler.”]