Low-pass filtering the residual before a chi-squared detector reduces the nominal covariance and makes low-frequency sensor attacks substantially easier to detect, at the cost of enabling new high-frequency stealthy attacks.
At- tacks against process control systems: Risk assessment, de tection, and response,
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Filtering Approaches for Dealing with Noise in Anomaly Detection
Low-pass filtering the residual before a chi-squared detector reduces the nominal covariance and makes low-frequency sensor attacks substantially easier to detect, at the cost of enabling new high-frequency stealthy attacks.