In other words, a "bad guy." Contrast with white hat hacker and blue hat hacker. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction requires permission.

In a presentation at the Black Hat USA 2010 conference in Las Vegas, Jack, director of research at IOActive, a Seattle-based security consulting company, used software to trick two standard ATMs ...

During a Black Hat USA conference presentation Thursday ... Glucose Monitor and an insulin pump -- could be infiltrated by hackers and used for extortion or even lethal attacks against a user ...