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The performance of different anomaly detection algorithms is typically compared using metrics that depend on the true positive rate (TPR) and the false positive rate (FPR). However, to obtain the TPR it is necessary to generate attacks that will be detected, which is useless to evaluate detection strategies against more realistic adversaries that can adapt their attacks to remain undetected. On the other hand, the FPR can be misleading and hard to interpret in practical applications since the amount of time a process is observed is not fixed. In this poster, we present a novel metric that is based on the maximum impact an adversary can cause while remaining stealthy, and on the expected time between false alarms. Our metric is useful for the evaluation and comparison of anomaly detection strategies in CPS.

A new metric to compare anomaly detection algorithms in cyber-physical systems