New Study May Add to Skepticism Among Security Experts That North Korea Was Behind Sony Hack

The New York Times reports:

A number of private security researchers are increasingly voicing doubts that the hack of Sony‘s computer systems was the work of North Korea.

President Obama and the F.B.I. last week accused North Korea of targeting Sony and pledged a “proportional response” just hours before North Korea’s Internet went dark without explanation. But security researchers remain skeptical, with some even likening the government’s claims to those of the Bush administration in the build-up to the Iraq war.

Fueling their suspicions is the fact that the government based its findings, in large part, on evidence that it will not release, citing the “need to protect sensitive sources and methods.” The government has never publicly acknowledged doing so, but the National Security Agency has begun a major effort to penetrate North Korean computer networks.

Because attributing the source of a cyberattack is so difficult, the government has been reluctant to do so except in the rarest of circumstances. So the decision to have President Obama charge that North Korea was behind the Sony hack suggested there is some form of classified evidence that is more conclusive than the indicators that the F.B.I. made public on Friday. “It’s not a move we made lightly,” one senior administration official said after Mr. Obama spoke.

Doubts.