Association of Computer Electronics and Electrical Engineers
The primary purpose of intrusion detection system is to detect attacks against information systems in general. Anomaly detection is an active problem that has been studied within diverse research area and the application domain. First with the introduction to anomaly-based intrusion detection systems, different approaches and techniques have been proposed to observe new attacks on the network systems. The authors have grouped these existing techniques into different categories based on the primary approach taken by each technique. In this paper, they review the some of the important techniques which shows their basic properties and working.