Improved Algorithm of Pattern Matching for Intrusion Detection

Firstly pattern matching is briefly introduced in this paper, followed by the analysis of some typical algorithms just as BM algorithm, BMH algorithm, BMHS algorithm. Based on these analyses, a new improved algorithm is presented. The algorithm uses a matching way that is from two ends to the middle, and finds a character which can make a rightward shift larger, also can decrease the times of comparing and enhance the matching speed effectively. Experiments show that the algorithm is more effective when the pattern string is long.