Study and Evolution of Intrusion Detection Technology

Intrusion detection system (IDS),as a newly emerging security technology, is the important part of whole security system. Basic principle and functional modules of intrusion detection system are expatiated in this paper , which depicts classification of intrusion detection system based on data source,detection method and detection timing . The actualites of study on intrusion detection technology at home and abroad , such as misuse detection , anomaly detection are also discussed and analyzed . With the development of computer and network technologies, and the popularization of wide-band transportation, traditional centralized intrusion detection systems based on stand-alone computer are unable to meet the security requirements. Therefore, the distributed intrusion detection (DID) has developed into the focus of intrusion detection and the whole realm of network security and offers some technology and theories reliance for the study of intrusion detection.