computer s favorite websites. and they can redirect users to a dummy site. it looks like a real page, but it s a fake one. when you go there, what does the nsa want to find out? one would be to intercept and sniff your traffic. i would be logging into this page and they would be able to see. now they have my user name and password. but in this particular scenario, what they want to do is infect my machine. reporter: but they don t do just remote hacking. they physically intercept some computers being delivered to plant spy wear and plant their own monitor cables and usb plugs. an nsa official told cbs s 60 minutes, they were concerned enough about the cages on edward snowden s computers that they removed those.