used by the north korean government. they say that, for example, the fbi found encryption algorithms, code, data that was included in the malware code that was telltale signs that it came from north korea. things they've seen before. they say that they tracked all of this traffic that the -- that was used, again, to attack the sony computer systems and it tracked right back to north korea. >> initially when this first happened a lot of voices were saying that it was likely north korea. it has taken time. we have heard that the white house and officials and the government was going to officially name. talk about the significance of that official declaration, that official finger pointing. >> it's very -- it's very unusual to do this so quickly. i mean, we're talking about a hack that happened only a few months ago. the last time we had an incident like this, which is earlier this year, where the u.s. government pointed the finger at the