An Adaptive Threshold Method for Anomaly-based Intrusion Detection Systems
Date of Original Version
Anomaly-based Detection Systems (ADSs) attempt to learn the features of behaviors and events of a system and/or users over a period to build a profile of normal behaviors. There has been a growing interest in ADSs and typically conceived as more powerful systems One of the important factors for ADSs is an ability to distinguish between normal and abnormal behaviors in a given period. However, it is getting complicated due to the dynamic network environment that changes every minute. It is dangerous to distinguish between normal and abnormal behaviors with a fixed threshold in a dynamic environment because it cannot guarantee the threshold is always an indication of normal behaviors. In this paper, we propose an adaptive threshold for a dynamic environment with a trust management scheme for efficiently managing the profiles of normal and abnormal behaviors. Based on the assumption of the statistical analysis-based ADS that normal data instances occur in high probability regions while malicious data instances occur in low probability regions of a stochastic model, we set two adaptive thresholds for normal and abnormal behaviors. The behaviors between the two thresholds are classified as suspicious behaviors, and they are efficiently evaluated with a trust management scheme.
2019 IEEE 18th International Symposium on Network Computing and Applications, NCA 2019
Chae, Younghun, Natallia Katenka, and Lisa Dipippo. "An Adaptive Threshold Method for Anomaly-based Intrusion Detection Systems." 2019 IEEE 18th International Symposium on Network Computing and Applications, NCA 2019 , (2019). doi:10.1109/NCA.2019.8935045.