an outage of hours upon hours even for north korea, a country known for not having electricity or food for its people is unusual. as matthew prince and i weigh the possible culprits, a surprise on state-run website kcna. >> it's back up. >> reporter: i'm hearing that kcna appears to be back up. that, says the editor of a hacker magazine, points to the most likely culprit, the rogue hacker, the on and off of north korea's web, the hallmarks of a denial of service attack. >> i'd say any 14-year-old kid in this country could probably pull it off and any toddler in germany. it's not hard. >> reporter: some hackers online have said they're responsible but the hacking and security community are extremely suspicious of anyone claiming credit. we'll likely never know who did this, adding to the long list of things we already don't know about north korea. kyung lah, cnn, seoul.