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Kevin Poulsen, aka Dark Dante, was first noticed after hacking into the phone lines of LA-based radio station KIIS-FM, in order to make sure he was the 102nd caller -- and landing himself the prize of a Porsche as a result.
However, his antics didn't stop there. He also reactivated old Yellow Pages escort numbers for a friend who ran a virtual agency, hacked into a federal investigation database for wiretap information, and was dubbed "the Hannibal Lecter of computer crime."
He even appeared on television show Unsolved Mysteries -- and strangely enough, all of the phone lines mysteriously crashed.
Ultimately, Poulsen was snagged in a supermarket and served five years in prison. After his release, Poulson reinvented himself as a journalist -- and is known for a Wired article on identifying 774 sex offenders with MySpace profiles.
In 2004, Sven Jaschan was found guilt of writing both the Netsky and Sasser worms whilst he was still a teenager. At that point in time, the viruses were considered responsible for 70 percent of all malware present online.
As he was still a teenager, after being convicted, Jaschan was given a suspended sentence and three years probation. However, there was a silver lining -- he was later hired by a security firm.
Adrian Lamo -- nicknamed the 'homeless hacker' due to his delight in using coffee shops, libraries and Internet cafés as his bases, rather than home.
Lamo's claims to fame include breaking into the networks of major organizations. Most of the time, he focused on penetration testing, finding security flaws and reporting findings to the companies that owned them. Lamo broke into the intranet of the New York Times and added his name to their database of experts and gaining access to sensitive information including Social Security numbers.
Other hits included Microsoft, Yahoo!, Bank of America, Citigroup and Cingular.
White-hat hackers are hired for this type of testing -- but Lamo was not. Therefore, after his New York Times break-in, he was ordered to pay approximately $65,000, sentenced to six months of home confinement and two years of probation. Lamo is now working as a journalist and public speaker.