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Gary McKinnon was once accused of being the "biggest military computer hack of all time" by a U.S. prosecutor. Born in 1966, McKinnon was accused of trawling through NASA computing systems and those of the U.S. defense department.
He stated it was to find evidence of free energy suppression and to look for information on UFO activity.
After leaving a trail of rude messages about the state of the system's security, he was arrested by British police. No evidence has been discovered so far of any damage done to the systems in question.
More than a decade has passed, but McKinnon is currently fighting extradition to the United States. He was placed at "extreme" risk of suicide if extradited in a recent psychiatric assessment, and Nick Clegg is reported to have said:
"Gary McKinnon is a vulnerable young man and I see no compassion in sending him thousands of miles away from his home and loved ones to stand trial. If he has questions to answer, there is a clear argument to be made that he should answer them in a British court."
Jonathan James became famous for being the first juvenile to be carted off to prison for illegal computing activity. At 16 years old, James targeted high-profile organizations including an agency of the Department of Defense, the Defense Threat Reduction Agency (DTRA) and NASA.
In an interview, he said:
"I was just looking around, playing around. What was fun for me was a challenge to see what I could pull off."
It ended up being a little more than a few challenges. James installed a backdoor into the DTRA's server so he was able to view sensitive emails and catch profile details, and in the case of NASA, he hacked into computers and stole software worth approximately $1.7 million, according to reports.
NASA ended up shutting down its computer systems, resulting in costs of $41,000 according to the Department of Justice. James aka 'c0mrade' would have possibly faced a minimum of ten years in prison if he was an adult at the time. Instead, he was banned from recreational computer use, and after breaking a house arrest parole, ended up in prison for six months.
Kevin Mitnick, described by the U.S. Department of Justice as "the most wanted computer criminal in United States history", was known as a self-styled 'poster boy' for hacking.
Famous for allegedly accessing high-profile computer systems of companies including Nokia, Fujitsu and Motorola, Mitnick became a player in a highly publicized dance and chase by authorities before being arrested in 1995.
Mitnick was convicted for breaking into the Digital Equipment Corporation's computer network and stealing software. Before that particular stunt, he was known for exploiting bus punch card systems in LA and phone phreaking.
He pleaded guilty to several charges as part of a plea bargain and served a 5-year sentence -- 8 months reportedly in solitary confinement -- before being released on parole. Today, Mitnick runs a computer security consultancy and is a public speaker and author.