It's not like Toyota hasn't already faced its fair share of Prius braking issues, but it appears that even more headaches are headed its way at Defcon this week. Famed white hats Charlie Miller and Chris Valasek are preparing to unleash a 100-page paper at the annual hacker conference in Las Vegas, and notably, hacks that overtake both Toyota and Ford automotive systems will be positioned front and center. The information was gathered as