A New Intrusion Detection Method Based on Discriminant Analysis

Midori ASAKA  Takefumi ONABUTA  Tadashi INOUE  Shunji OKAZAWA  Shigeki GOTO  

Publication
IEICE TRANSACTIONS on Information and Systems   Vol.E84-D   No.5   pp.570-577
Publication Date: 2001/05/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8532
Type of Manuscript: Special Section PAPER (Special Issue on High-speed Internet Technology and its Applications)
Category: 
Keyword: 
intrusion detection,  discriminant analysis,  multivariate analysis,  network security,  system call,  

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Summary: 
Many methods have been proposed to detect intrusions; for example, the pattern matching method on known intrusion patterns and the statistical approach to detecting deviation from normal activities. We investigated a new method for detecting intrusions based on the number of system calls during a user's network activity on a host machine. This method attempts to separate intrusions from normal activities by using discriminant analysis, a kind of multivariate analysis. We can detect intrusions by analyzing only 11 system calls occurring on a host machine by discriminant analysis with the Mahalanobis' distance, and can also tell whether an unknown sample is an intrusion. Our approach is a lightweight intrusion detection method, given that it requires only 11 system calls for analysis. Moreover, our approach does not require user profiles or a user activity database in order to detect intrusions. This paper explains our new method for the separation of intrusions and normal behavior by discriminant analysis, and describes the classification method by which to identify an unknown behavior.