David Umsonst

I am a PhD student in the Division of Decision and Control Systems under the supervision of Prof. Henrik Sandberg.

My research interest focuses on the security of cyber-physical systems. I currently focus on the feasibility of sensor attacks, their impact on feedback systems, and attack mitigation methods utilizing anomaly detectors. I successfully defended my PhD thesis titled "Stealthy Sensor Attacks on Feedback Systems: Attack Analysis and Detector-based Defense Mechanisms" on the 9th of November, 2021.

In addition to my research activities, I was a teaching assisstant in the courses Automatic Control (2017, 2018), and Hybrid and Embedded Control Systems (2019, 2020) as well as responsible for the watertank laboratory at our division.

Furthermore, I participated in the EU-project LarGo!, where I was involved in the resilient system design for the software rollout in the future power grid. In the EU-project SPARKS, I was working on the resilient controller design for PV systems. You can find a video of the final demonstration of the SPARKS project here, where I present parts of the resilient controller design.

Publications:

• D. Umsonst and H. Sandberg, "On the confidentiality of controller states under sensor attacks", in Automatica, Volume 123, January 2021 (Editor's choice in January 2021)
• D. Umsonst,  S. Sarıtaş, and H. Sandberg, "A Nash equilibrium-based moving target defense against stealthy sensor attacks", in the 59th IEEE Conference on Decision and Control, December 2020
• D. Umsonst, E. Nekouei, A. Teixeira, and H. Sandberg, "On the Confidentiality of Linear Anomaly Detector States", in 2019 American Control Conference (ACC), July 2019
• D. Umsonst and H. Sandberg, "A Game-Theoretic Approach for Choosing a Detector Tuning Under Stealthy Sensor Data Attacks", in the 57th IEEE Conference on Decision and Control, December 2018
• D. Umsonst and H. Sandberg, “Anomaly detector metrics for sensor data attacks in control systems,” in 2018 Annual American Control Conference (ACC), June 2018
• J. Milošević, D. Umsonst, H. Sandberg, and K. H. Johansson, “Quantifying the impact of cyber-attack strategies for control systems equipped with an anomaly detector,” in European Control Conference 2018, June 2018
• D. Umsonst, H. Sandberg, and A. A. Cárdenas, “Security analysis of control system anomaly detectors,” in 2017 American Control Conference (ACC), May 2017