because it's unauthenticated you can't prove this came from the real plane. that means hackers could mess up the system by generating flights that don't exist. >> you could theoretically ground everybody. >> or they could target a real flight with frightening precision. everyone can generate that same kind of data and inject it it into the system for whatever nefarious reason you can imine. it's put into a flight simulator to show what can happen if the system is hacked. >> we are able to create a flight and we are able to take off from san francisco airport and circle over the bay and buzz the tower. >> the consequence of putting a ghost flight on the air traffic controller's panel could be disastrous. the air traffic controller is one of the most stressful jobs out there. if i suddenly injected 50 extra flights on to the radar screen and they hadn't expected, they're going to be panicking trying to figure out what's going on. >> todd humphries, an expert on navigation systems believes renderman is on to something upon. a potentially cat strofk flaw that cou