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Re:North Korea, Denying Sony Attack, Proposes Joint Investig... by freditup on Saturday December 20, 2014 @11:14AM (#8776968)
A few quick answers:

1) Yes, probably. They have some sort of a cyber military organization, and it wouldn't even have to be _that_ sophisticated to pull this off. In brief see http://www.telegraph.co.uk/news/worldnews/asia/northkorea/11...

2) They're afraid of the repercussions given the massive public reaction to the hack. This isn't a fully persuasive line of reasoning, but it seems like a possibility.

3) You can see some of the evidence explained here: http://www.fbi.gov/news/pressrel/press-releases/update-on-so...

Re:North Korea, Denying Sony Attack, Proposes Joint Investig... by crdoconnor on Saturday December 20, 2014 @01:14PM (#8777341)
>They're afraid of the repercussions

There would be no repercussions for NK admitting that they did it.