But some security researchers imagine a less sensational, if equally troubling possibility: Hundreds or thousands of aircraft radioing their approach to an air traffic control tower, and no way to sort through which are real and which are ghost plane signals crafted by a malicious hacker.
So far, the system had worked, with no fraud reported, although this week, many people could not get through as publicity about the site caused Internet traffic to jump to 28 times normal levels.