Hacker convention in Vegas is full of tin-foil hats. Literally.

What if they really are out to get you.  If you spend enough time walking the Las Vegas casino floors, you're sure to come across some unique sights. But scores of people sporting all shapes and sizes of literal tin-foil hats? Welcome to DEF CON. SEE ALSO: The hackers just arrived, and they're already breaking Vegas The annual hacker convention currently underway in the Nevada desert draws a diverse crowd of professional and hobbyist security researchers from around the world. And, for the most...