SCPSE: Security-oriented cyber-physical state estimation for power grid critical infrastructures

Saman Zonouz, Katherine M. Rogers, Robin Berthier, Rakesh B. Bobba, William H. Sanders, Thomas J. Overbye

Research output: Contribution to journalArticlepeer-review


Preserving the availability and integrity of the power grid critical infrastructures in the face of fast-spreading intrusions requires advances in detection techniques specialized for such large-scale cyber-physical systems. In this paper, we present a security-oriented cyber-physical state estimation (SCPSE) system, which, at each time instant, identifies the compromised set of hosts in the cyber network and the maliciously modified set of measurements obtained from power system sensors. SCPSE fuses uncertain information from different types of distributed sensors, such as power system meters and cyber-side intrusion detectors, to detect the malicious activities within the cyber-physical system. We implemented a working prototype of SCPSE and evaluated it using the IEEE 24-bus benchmark system. The experimental results show that SCPSE significantly improves on the scalability of traditional intrusion detection techniques by using information from both cyber and power sensors. Furthermore, SCPSE was able to detect all the attacks against the control network in our experiments.

Original languageEnglish (US)
Article number6376274
Pages (from-to)1790-1799
Number of pages10
JournalIEEE Transactions on Smart Grid
Issue number4
StatePublished - 2012


  • Cyber-physical systems
  • intrusion detection
  • maliciously corrupted data detection
  • security-state estimation

ASJC Scopus subject areas

  • General Computer Science


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