Date Added: Feb 2013
Now-a-days, with the rapid development of the Internet, Internet security is becoming an important problem recently. Everyone wants to protect their data from both the internal and external attacks. In this initiative firewall, encryption and authentication serve as the first line of defense. And intrusion detection serves as the second line of defense. Intrusion detection has become an indispensable tool to keep information systems safe and reliable. In this paper data mining techniques used for intrusion detection. Most of works in this area are done as binary classification, while intrusion detection is multiclass classification approach.