As a young man, Kevin Mitnick became the world’s most notorious black hat hacker, breaking into the networks of companies like IBM, Nokia, Motorola, and other targets. After a stint in prison, he reinvented himself as a white hat hacker, selling his skills as a penetration tester and security consultant. With his latest business venture, Mitnick has switched hats again: This time to an ambiguous shade of gray.

http://www.wired.com/2014/09/kevin-mitnick-selling-zero-day-exploits/