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Intrusion detection is the process of monitoring the events occurring in a computer system or network and analyzing them for signs of possible incidents, which are violations of computer security policies, or standard security practices. Intrusion detection system identifies possible incidents, logs information and provides report about them. In this article a real time intrusion detection system using SNORT rules and KMP algorithm is implemented in reconfigurable hardware. The parallel structure of this architecture let us to achieve a high real time performance at rate 100Mbps as it is shown by simulation and synthesis results on VIRTEX4.