North Korea May Have Had Help From the Hackers Who Hit Sony in 2011

The sweeping conclusion by President Obama and the FBI last week, blaming North Korea for the Sony hack, was clean and, to many, wholly satisfying. It’s unusual that a huge cyber-crime is solved so definitively and so quickly. It felt like something out of the movies.

But cyber-sleuths unaffiliated with the U.S. government, who are conducting their own investigations, have uncovered some clues that suggest there was more to the attack. A group of "hacktivists" who have been targeting Sony for years, including in the 2011 attack that took down the PlayStation Network, may have also played a role.