Research and improvement of multi-mode matching algorithm based on KR-BMSH

The improvement of pattern matching algorithm is a key to improve the efficiency of network intrusion detection. Firstly, this thesis analyzes the current mainstream of single mode and multi-mode matching algorithm; then an improved multi-mode matching KR-BM2 algorithm based on KR algorithm and BM2 algorithm is proposed. BM2 algorithm using dual characters determines to move distance of the pattern string to the right, and uses the hash algorithm to reduce the number of comparisons in each match. KR-BM2 algorithm realizes the multi-pattern matching algorithm and the matching performance is improved. Finally the improvement of the proposed algorithm in the time performance is verified by experimental results.