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The Cuckoo's Egg

The Cuckoo's Egg, by computer scientist Clifford Stoll, details his investigation of a computer hacker who had gained unauthorized access to a computer at the Lawrence Berkeley National Laboratory (LBL) in 1986. Stoll's ten-month-long hunt in coordination with various law enforcement agencies led to the capture of German hacker Markus Hess.(1)

In August 1986, Stoll's LBL supervisor asked him to resolve an account disparity of seventy-five cents in the laboratory's computer usage bill. Despite its seeming intractability, Stoll was able to establish that a hacker had not only used nine seconds of unpaid-for computer time, but had gained root access to the system by exploiting a vulnerability in the time-sharing software. Stoll determined, with the help of colleagues, on the hacker's next modem-based attack was able to trace the call back to a call center at MITRE, a defense contractor in Virginia, one of the places that the hacker had gained access to in the United States. Stoll then monitored the hacker as he attempted to gain access to computers at various military bases, searching for information on nuclear weapons and on the Strategic Defense Initiative (the "Star Wars" anti-ballistic missile system). Stoll contacted the FBI, CIA, and NSA, but there was some confusion about whose jurisdiction computer hacking fell under.(2)

Finally, Stoll made an educated guess that the hacker lived in a European time zone based on the timing of his attacks. With the help of several agencies, including the West German Deutsche Bundespost (the West German Post Office), Stoll traced the hacker to a university in Bremen. Stoll then set a trap, placing large files with names that the hacker would find attractive on the LBL computer. When the hacker accessed these files, the Deutsche Bundespost was able to trace him to his home in Hanover, and identify him as Markus Hess. Hess was arrested, and it was revealed that he had been selling things he learned to the Soviet Union. Stoll later flew to West Germany to testify at Hess' trial.(3)


1 , 2 , 3 : Clifford Stoll, The Cuckoo's Egg: Tracking a Spy Through the Maze of Computer Espionage. New York: Doubleday, 1989.

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