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Loyd Blankenship, also known as 'The Mentor', was a member of several hacker elite groups in the 1980s. The most famous was called the 'Legion of Doom' -- a group who stipulated they fought against rivals the 'Masters Of Deception' for online supremacy.
However, Blankenship is more famously known for writing the 'Hacker Manifesto' -- The Conscience of a Hacker -- which was written after his arrest in 1986. The book in question is still used by hackers today, and by some is considered a cornerstone of hacker philosophy -- namely that curiosity is the main crime of hackers, rather than simply conniving to break the law.
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.