In modern production plants different system components are becoming more and more connected through communication networks. While the flexibility and the reconfigurability improve significantly, the vulnerability to cyber attacks increases as well. In order to better protect production plants from cyber attacks, new algorithms are being developed for early detection of cyber attacks based on the system theory. Moreover, it is investigated how to mitigate the influence of cyber attacks on the system behaviour.

Publications:

• X. Li, P. Zhang, H. Dong. A robust covert attack strategy for a class of uncertain cyber-physical systems. IEEE Transactions on Automatic Control, Vol. 69, No. 3, pp. 1983-1990, 2024.
• R. Fritz, P. Zhang. Detection and Localization of Stealthy Cyber Attacks in Cyber-Physical Discrete Event Systems. IEEE Transactions on Automatic Control, 2023, DOI: 10.1109/TAC.2023.3253462.
• D. Mikhaylenko, P. Zhang. Stealthy local covert attacks on cyber-physical systems. IEEE Transactions on Automatic Control, Vol. 67, No. 12, pp. 6778 – 6785, 2022.
• M. Fauser, P. Zhang. Detection of cyber attacks in encrypted control systems. IEEE Control Systems Letters, Vol. 6, pp. 2365-2370, 2022.
• D. Mikhaylenko, P. Zhang. Robust mirror attacks on cyber-physical systems. Proceedings of the 10th International Conference on Control, Decision and Information Technologies (CoDIT), Valetta, Malta, 2024.
• M. Fauser, P. Zhang. Multi-slot resilient homomorphic encryption of dynamic feedback controllers. Proceedings of the 10th International Conference on Control, Decision and Information Technologies (CoDIT), Valetta, Malta, 2024.
• M. Fauser, P. Zhang. Practical aspects of homomorphic encryption schemes for dynamic feedback controllers. Proceedings of the 10th International Conference on Control, Decision and Information Technologies (CoDIT), Valetta, Malta, 2024.
• J. Costales, D. Munoz, O. Yadgar, M. Fauser, P. Zhang. Application of digital signature to attack detection in a DC motor control system. Proceedings of the 12th IFAC Symposium on Fault Detection, Supervision and Safety for Technical Processes (SAFEPROCESS), Ferrara, Italy, 2024.
• J. Sun, P. Zhang, B. Shen. An approach to secret sharing based secure remote monitoring. Proceedings of the 12th IFAC Symposium on Fault Detection, Supervision and Safety for Technical Processes (SAFEPROCESS), Ferrara, Italy, 2024.
• M. Jia, P. Zhang. Attack isolation in a water treatment plant. Proceedings of the 12th IFAC Symposium on Fault Detection, Supervision and Safety for Technical Processes (SAFEPROCESS), Ferrara, Italy, 2024.
• M. Jia, P. Zhang. Detection of cyber attacks on a water distribution testbed. Proceedings of the6th IEEE Conference on Control Technology and Applications (CCTA), pp. 1354-1359, Trieste, Italy, 2022.
• M. Al-Dhaheri, P. Zhang, D. Mikhaylenko. Detection of cyber attacks on a water treatment process. Proceedings of the 11th IFAC Symposium on Fault Detection, Supervision and Safety for Technical Processes (SAFEPROCESS), pp. 674-679, Pafos, Cyprus, 2022.
• X. Li, P. Zhang, H. Dong. Robust stealthy covert attacks on cyber-physical systems. Proceedings of the 11th IFAC Symposium on Fault Detection, Supervision and Safety for Technical Processes (SAFEPROCESS), pp. 527-532, Pafos, Cyprus, 2022.
• D. Mikhaylenko, P. Zhang. Stealthy targeted local covert attacks on cyber-physical systems. Proceedings of the 2021 Conference on Decision and Control (CDC), 2021.
• M. Fauser, P. Zhang. Resilient homomorphic encryption scheme for cyber-physical systems. Proceedings of the 2021 Conference on Decision and Control (CDC), 2021.
• M. Fauser, P. Zhang. Resilience and detection of cyber-physical systems to covert attacks by exploiting frequency hopping spread spectrum. Proceedings of the 2021 American Control Conference (ACC), pp. 4621-4626, 2021.
• M. Fauser, P. Zhang. Resilience of cyber-physical systems to covert attacks by exploiting an improved encryption scheme. Proc. of the 59th IEEE Conference on Decision and Control (CDC), pp. 5489-5494, 2020.
• D. Martynova, P. Zhang. Completely stealthy attacks on cyber-physical system with parity space based monitoring. Proceedings of the 2019 American Control Conference (ACC), pp. 4424-4429, Philadelphia, USA, 2019.
• R. Fritz, M. Fauser, P. Zhang. Controller encryption for discrete event systems. Proceedings of the 2019 American Control Conference (ACC), pp. 5633-5638, Philadelphia, USA, 2019.
• R. Fritz, P. Schwarz, P. Zhang. Modeling of Cyber Attacks and a Time Guard Detection for ICS Based on Discrete Event Systems. Proceedings of the 2019 European Control Conference (ECC), pp. 4368-4373, Naples, Italy, 2019.
• D. Martynova, P. Zhang. An approach to encrypted fault detection of cyber-physical systems. Proceedings of the 2019 Asian Control Conference (ASCC), pp. 1501-1506, Kitakyushu, Japan, 2019.
• R. Fritz, P. Zhang. Modeling and detection of cyber attacks on discrete event systems. Proceedings of the 14th Workshop on Discrete Event Systems (WODES), pp. 296-301, Sorrento Coast, Italy, 2018.
• D. Martynova, P. Zhang. Secure estimation and attack detection in cyber-physical systems with switching attack. Proceedings of the 2018 European Control Conference (ECC), pp. 356-361, Limassol,Cyprus, 2018.
• R. Fritz, P. Zhang. Detektion von Angriffen auf Cyber-Physische Fertigungssysteme. Proceedings of the 2018 Automation, pp. 69-80, Baden-Baden, Germany, 2018.
• C. Schellenberger, P. Zhang. Detection of covert attacks on cyber-physical systems by extending the system dynamics with an auxiliary system. Proceedings of the 56th IEEE Conference on Decision and Control (CDC), pp. 1374-1379, Melbourne, Australia, 2017.
• A. Höhn, P. Zhang. Detection of replay attacks in cyber-physical systems. Proceedings of the 2016 American Control Conference (ACC), pp. 290-295, Boston, USA, 2016.
• A. Höhn, P. Zhang. Detection of covert attacks and zero dynamics attacks in cyber-physical systems. Proceedings of the 2016 American Control Conference (ACC), pp. 302-307, Boston, USA, 2016.

Dissertation:

• R. Fritz. Cyber Security for Discrete Event Systems. Logos Verlag Berlin. ISBN 978-3-8325-5799-7. 2024.

Master Thesis:

• F. V. De Souza Lopes. Investigation of Partially Homomorphic Encryption in Cloud-Based Remote Monitoring of Machines. 2022.
• J. Trieb. Creatin of a Digital Twin for Manufacturing Process. 2022.
• M. Jia. Detection and Isolation of Cyber Attacks on Walter Systems. 2022.
• P. Marijan. Investigation of Opacity in SIPNs and Its Application to a Laboratory Plant. 2021.
• M. Al-Dhaheri. Detection of Cyber Attacks on a Water Treatment Process. 2021.
• S. Aglikat. Cyber-Risikoanalyse für komplexe PLT-Schutzeinrichtungen in Industrieanlagen. 2020.
• M. Kramers. Untersuchung eines Local-Covert-Angriffs auf Cyber-physische Systeme. 2019.
• M. Fauser. Detektion von Cyberangriffen auf industrielle Steuerungssysteme. 2019.
• P. Schwarz. Cyber-Angriffe und deren Detektion in ereignisdiskreten Systemen. 2018.
• D. Martynova. Cyber-Physical Systems Security. 2017.
• Ch. Schellenberger. Detection of deceptive attacks in cyber-physical systems. 2017.
• A. Höhn. Angriffsszenarien und deren Detektion in cyber-physischen Systemen. 2016.

Master Project:

• J. E. Barbosa Costales. Evaluation of several recent encryption approaches for control systems. 2024.

Bachelor Thesis:

• N. Krebs. Erweiterung und Implementierung einer Steuerungsverschlüsselung für ereignisdiskrete Systeme. 2019.
• M. Fauser. Steuerungsverschlüsselung für ereignisdiskrete Systeme. 2018.