Once most people learn what is a black hacker, they immediately try to find who’s the best one. Many consider Kevin Mitnick to be the best in the business. Initially, a black hat hacker, Mitnick has gone a long way in his career. He went from being on the FBI’s most-wanted list to operating highly-sought-after internet security consulting business. Some still see Mitnick as the bad guy, especially because according to some reports, he could’ve started a nuclear war just by whistling codes into a phone.