A case study on hunting a brilliant hacker

In December 1989, a computer intruder broke into the computer systems in Academia Sinica, Taipei. Instead of trying to keep the intruder out, the approach was taken of allowing him access and tracing his activities. Instead of using printers, personal computer and hard disk were used to record the intruder´s activities. The trace was harder than expected; it took nearly two months. The search for the intruder was stopped for two reasons: the first was that he was not harmful-he only wanted free computer and communication resources; the second was that not much help could be obtained from the telecommunications bureau and security department