Donn Parker's Categories of Hacker :
- - the hacker whose intentions are purely educational
- - the intruder whose intentions are not necessarily malicious but whose very presence can be
- - the intruder whose primary intention is to cause the system to crash or to wreck havoc in its
 Parker, Donn, and John F. Maxfield. 1985. "The Nature and Extent of Electronic Computer Intrusion",
Workshop on Protection of Computer Systems and Software, National Science Foundation.
Lightly edited 96/04/30