10 Gary McKinnon
Gary McKinnon was an unemployed computer systems administrator when he, in 2001, began accessing computer systems belonging to the US military. He deleted important OS files and the US government claimed that he had caused hundreds of thousands of dollars worth of damage to systems that controlled missiles and important information as he searched for information on free energy and UFOs. According to the officials, this was the biggest ever attack on computer systems in America by a single person.
9 Michael Bevan & Richard Pryce
8 Kevin Mitnick
7 Vladimir Levin
6 Michael Calce
5 Jeanson James Ancheta
4 Adrian Lamo
3 Owen Walker
2 Albert Gonzalez
Although the real name of this hacker has never been officially released, Greek police did reveal that he was a 58-year-old mathematician who was living in Athens. The man had been wanted for various computer crimes since 2002 but came under further scrutiny in 2005 when he hacked into the systems of Dassault, a French military company. He then stole sensitive information on weapons, aircraft and other technology before selling it on to other parties. Prosecutors argued that the hacker had caused upwards of $360 million worth of damage to Dassault.
Sources: bbc.com, wired.com, latimes.com, npr.org, fbi.gov, telegraph.co.uk, theregister.co.uk
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