Application and improvement of pattern matching technology in snort

There are several pattern matching technologies in common use currently.There is much limitation in snort's pattern matching methods.Protocol matching and character matching have their weakness too.We can synthetically make use of many matching technologies and improve upon them in order to availably improve Intrusion Detection System(IDS)'s dependability.Employing protocol analysis can greatly cut down the amount of calculation and improve accuracy and reduce the rate of positive error;improvement about BMH can further raise the rate of matching.Sequentially we can develop an efficient IDS based on Snort.