As suspicions grow that North Korea was indeed responsible for the Sony hack, North Korea offers that oddly unconvincing denial. If the North Koreans really did do it, some commenters think the U.S. will have to respond: Aitel says the hacks are potentially “a ‘near red-line moment’” because they represent the kind of incident that would almost require a US policy response assuming a rival state was behind it. As Aitel says, “This is the first demonstration of what the military would call...

Since the weekend, several of you have e-mailed me about “suspicions” – and really, I don’t think they went further than that – that and leaked unreleased movies to file sharers to punish it for “The Interview.” Those rumors were covered by many outlets, but frankly, the open-source evidence for North Korea’s complicity was little more than speculation, at least until I read this today: Hackers who knocked Sony Pictures Entertainment’s computer systems offline last week used tools very similar...