Every year, scores of security experts gather up in Las Vegas, Nevada, for the annual Black Hat conference, and plenty of major companies have swallowed their pride and involved themselves in an event which doesn't view exposing security vulnerabilities as taboo. Apple, however, has always been a glaring absentee, but in a real turn up for the books, the Cupertino company has agreed to give a presentation at 2012's Black Hat, taking place this Thursday.