poster showing kim jong un dressed as an obese pig with a mickey mouse tattoo on his gut. it blared the word hacked and showed an image of a mask that is the favorite symbol of the hacking group anonymous. that sounds totally like the north korean announcer. you can't help but laugh says this information security expert but this is latest shot in an on going and very serious cyber war between the two koreas that goes far beyond just the humiliation of a leader. which is the bigger threat, conventional war, nuclear war or this cyber war? >> cyber war. >> translator: the purpose of the cyber war is to enable the ability to fight. if the cyber war continues, there's a high possibility it could lead to a conventional war. in a country that claims to be the most wired in the world,