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See detailMultistage Downstream Attack Detection in a Cyber Physical System
Qadeer, Rizwan UL; Murguia, Carlos; Ahmed, Chuadhry Mujeeb et al

in 3rd Workshop on the Security of Industrial Control Systems and of Cyber-Physical Systems In Conjunction With ESORICS 2017 (2017, September)

We present a detection scheme for attacks on a Cyber-Physical System (CPS) in which we leverage the connectivity of a multistage process to detect attacks downstream from the point of attack. Our methods ... [more ▼]

We present a detection scheme for attacks on a Cyber-Physical System (CPS) in which we leverage the connectivity of a multistage process to detect attacks downstream from the point of attack. Our methods form a control theoretic approach to CPS security by characterizing a real water treatment facility with a mathematical model; obtaining a residual (error) signal from sensor measurements and sensor measurement estimates; and finally using Cumulative Sum (CUSUM) and Bad-Data detection methods to detect the presence of a sensor attack. In particular, the attacks are designed so that they do not raise alarms on the detectors in the same stage where the attack takes place, requiring detection to take place on a separate part of the system. Proposed scheme is implemented on a real world water treatment facility. Extensive experiments are carried out and results show the significance of the proposed scheme. [less ▲]

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