Editing Karl Koch (hacker) (section)

==Hacking==
He worked with the hackers known as DOB (Dirk-Otto Brezinski), Pengo (Hans Heinrich Hübner), and Urmel ([[Markus Hess]]), and was involved in selling hacked information from United States military computers to the [[KGB]]. [[Clifford Stoll]]'s book ''[[The Cuckoo's Egg]]'' gives a first-person account of the hunt and eventual identification and arrest of Hess in March 1989. Pengo and Koch subsequently came forward and confessed to the authorities under the espionage amnesty, which protected them from being prosecuted.<ref name="Phrack25">{{cite web
 | date=March 29, 1989
 | url = http://www.phrack.org/issues.html?issue=25&id=10#article
 | title = Phrack Inc. - Volume Three, Issue 25, File 10 of 11
 | publisher = [[Phrack]]
 | access-date = 2009-01-06
 | last=Knight Lightning
}}</ref>