Innocence, the south maintains the evidence is there. last year south korea banks and media were hacked and television news knocked off the air. similar mal-ware to what ground sony systems to a halt and similar code to what led to the latest breach of south korean power plants. this is a power. practice first in south korea and then aim overseas. >> should america be prepared for north korea to try to break in to these types of agencies in america? >> of course, he says. even though the u.s. is one of the best prepared nations, cyber attacks are really hard to protect yourself from. so they h...