Karl Koch was a German hacker in the 1980s, who called himself "hagbard", after Hagbard Celine, and his machine "fuckup". Supposedly he was the inventor of the first trojan horse software.
Karl worked with DOB, pengo, urmel and was CCC affiliated. He was heavily influenced by the Illuminatus trilogy by Robert Anton Wilson and Robert Shea. He was involved in selling hacked information from US military computers to the KGB. He was addicted to cocaine and got extremely paranoid and convinced he was fighting the Illuminati like Hagbard Celine in the fictitious book.
A movie has been made about his life which is called "23". It has been critized a lot by real life witnesses. More interesting is the documentation written by his friends (see [1] (http://seti23.org/kk.html))
