2011•Computers & SecurityRequires access

Improved Pattern Matching Algorithm of BM for Intrusion Detection

LI Zhi-qing

Abstract

The performance efficiency of a network intrusion detection system(NIDS) is dominated by pattern matching algorithm.On the basis of analyzing the most popular BM algorithm,an improved algorithm based on BM algorithm,N-BM algorithm,is presented.The algorithm uses the characteristic of pattern strings to decrease the times of comparing and improve the efficiency of the pattern matching by using the position shift replaces Good-Suffix-Shift and Bad-Character-Shift.In the end,the result of the experiment shows that this algorithm is able to accelerate the detecting velocity of NDIS.

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Key concepts: Intrusion detection system, Algorithm, Computer science, String searching algorithm, Pattern matching, Character (mathematics), Position (finance), Matching (statistics)