The FBI has attributed the Sony hack attack to North Korea, but many experts remain unconvinced. Security experts say the attack may instead have been launched by insiders or even random hackers. The Pyongyang-based government of North Korea has dismissed the FBI’s attribution, demanded a joint investigation into the hack with the United States and threatened reprisals if that doesn’t happen. President Obama has promised that the U.S. “will respond proportionally” to the attacks, although it’s not clear exactly what that response might entail.”]
Source: https://www.careersinfosecurity.com/sony-attribution-debate-rages-a-7722