also here, siobhan gorman, longtime national security and intelligence recorder. dr. lewison we could just start, and if he could explain to us what happened this past week? >> guest: this week wasn't really a big deal in many ways. this is a fairly basic attack. someone in fact thousands of computers, turns them into a zombie network and then has them launch packets at targets and then when the target computer gets hit with these thousands of packets it is overwhelmed and the crashes. they are easy fixes to this and what was interesting to me was that most agencies knew how to fend off this kind of attack but a few of them didn't and that is what is worrisome. this was a no-brainer. >> host: in other words is it fair to say this was a spam attack? >> guest: it is different from spam in that spam has a message and they want you to read it burgoine this uses the same techniques as spam but there wasn't a message. spam is the twin of this kind of attack. >> host: how do we know it came from north korea? >> guest: everyone is blaming north korea. i think we should blame