While white hat hackers work on improving the internet security, black hat hackers engage in illegal activity, often for their own benefit. Today, we present you 6 most notorious black hat computer hackers of all time.

1 computer hackers

Gary McKinnon – This systems administrator from Scotland is responsible for the largest military computer hack ever. He claims he was only looking for evidence that U.S. military covered up the UFO activity. Whether or not this is true, Gary managed to hack a total of 97 military and NASA computer systems. His biggest hack ever shut down a total of 2,000 computers in different U.S. military bases and destroyed numerous critical files.