Security of cyber-physical systems: A control-theoretic perspective
Hirzallah, Nabil H. K.
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https://hdl.handle.net/2142/102434
Description
Title
Security of cyber-physical systems: A control-theoretic perspective
Author(s)
Hirzallah, Nabil H. K.
Issue Date
2018-11-15
Director of Research (if dissertation) or Advisor (if thesis)
Voulgaris, Petros G.
Doctoral Committee Chair(s)
Voulgaris, Petros G.
Committee Member(s)
Hovakimyan, Naira
Sauer, Peter W.
Salapaka, Srinivasa M.
Belabbas, Mohamed A.
Department of Study
Electrical & Computer Eng
Discipline
Electrical & Computer Engr
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Security, Control Systems
Abstract
Motivated by the attacks on control systems through the cyber (digital) part, we study how signal attacks injected through actuators and/or sensors affect control system stability and performance. We ask the questions: What are the different types and scenarios of signal attacks? When are the attacks stealthy and unbounded? How to compute the worst stealthy bounded attacks? How to defend against such attacks through controller design? How to identify and estimate signal attacks before significant performance loss happens? We answer the above questions in this thesis using tools from control theory. We show that it is necessary to use a sampled-data framework to accurately assess the vulnerabilities of control systems. In addition, we show that the most lethal attacks are related to the structure of the system (location of zeros and poles, number of inputs and outputs). We show that dual rate control is a powerful tool to defend against these vulnerabilities, and we provide a related controller design. Furthermore, we show that the worst stealthy bounded attacks can be computed by an iterative linear program, and we show how to lessen their effects through iterative controller design. Finally, we study the trade-off between control and estimation of signal attacks and provide several controller designs utilizing the power of dual rate sampling.
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