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

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/11301430/Sony-hack-North-Koreas-Unit-121-cyber-attack-centre-in-60-seconds.html 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-sony-investigation http://www.fbi.gov/news/pressrel/press-releases/update-on-so...