A Self-supervised Sensors’ Anomaly Detection Scheme in Industrial Control Systems based on Ensemble Deep Learning
Subject Areas : ICT
Armin Salimi-Badr
1
,
Athena Abdi
2
,
Afshin Souzani
3
1 - Shahid Beheshti University
2 -
3 - Information and Communication Technology Research Institute
Keywords: Industrial Control System, Anomaly Detection, Deep Learning, Ensemble Learning, Correlation,
Abstract :
In this paper, a self-supervised one-class sensors’ anomaly detection approach based on ensemble deep learning for industrial control systems (ICS). Technological advancements have allowed them to connect to the internet to improve the performance of their remote control. Although this connection provides many advantages for ICS, it causes vulnerabilities against cyber-attacks. Anomaly detection is a prominent process to mitigate faults along with the cyber-attacks. In this context, several anomaly detection methods are proposed that are mainly based on local and short-term analyses of the data. The proposed method employs an ensemble deep learning scheme based on combining various temporal, spatial, local, and global characteristics of the individual detection agents during the prediction process, simultaneously. The detection agents have a homogenous workflow with heterogenous prediction structures to consider various characteristics of the input signal. The considered structures of the proposed detection method are based on Long-Short-Term Memory , Convolutional Neural Network, and fully connected encoder-decoder schemes. Each unit calculates a normal degree based on the prediction and reconstruction error for the input signal. The normal degree is calculated based on the statistics of the encoder-decoder error considering the correlations among spatial and temporal features. These structures execute in parallel and send their results to a weighted threshold gate voter to determine the final output. To evaluate the efficiency of the proposed method, several experiments on a simulated ICS are performed and the results demonstrate an average improvement of 14% in precision compared to related studies.
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