Abstract
This paper makes a summary of pattern matching algorithm in Intrusion Detection System: KMP algorithm, BM algorithm and BMH algorithm algorithm. The performances of various algorithms are analyzed, and then through the experiment data is verified. Last an improved algorithm based on the BM algorithm: BMD is proposed. BMD algorithm can reduce the space complexity and maintain the time complexity by reducing a pretreatment function and recording the number of times that a bad char found in the pattern.
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