cyber attacks by supporters of wikileaks against perceived enemies have shut down the web sites of several major companies, but there is growing concern that the skirmishes may be the beginning of a broader cyber war. cnn's brian todd is investigating. brian? >> wolf, all sorts of concerns right now about whether this kind of attack could escalate and take down some major companies, well, we have come to a place called northrup grumman which is on the firing line to do a lot to protect its clients. >> reporter: they have a buzzword name, and hacktivists, launching cyber attacks on many companies. they have a scary sounding weapon. >> they have a tool called the low orbit canon. >> reporter: that is software that allowing people online to