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Cybersecurity for Networked Control System.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Cybersecurity for Networked Control System./
作者:	Tang, Jiacheng.
面頁冊數:	1 online resource (126 pages)
附註:	Source: Dissertations Abstracts International, Volume: 84-04, Section: A.
Contained By:	Dissertations Abstracts International84-04A.
標題:	Electrical engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29712439click for full text (PQDT)
ISBN:	9798845452498

Cybersecurity for Networked Control System.
Tang, Jiacheng.

Cybersecurity for Networked Control System. - 1 online resource (126 pages)

Source: Dissertations Abstracts International, Volume: 84-04, Section: A.

Thesis (Ph.D.)--The Ohio State University, 2022.

Includes bibliographical references

This dissertation studies cybersecurity, with a focus on the control theory for cyber physical system (CPS). We consider CPS as a networked control system (NCS) where the sensing and control signals transmitted through the communication network can be compromised. To secure the NCS, we develop detection and response algorithms against adversarial attacks. In particular, we propose dynamic watermarking as an active detection scheme against sensor spoofing attacks, stochastic transmission of the control signals as a control response against bus-off (DoS) attack, and optimization on communication link elimination as a control response against general attack scenarios whenever network switching is needed. In all the cases, we show the efficacy of applying the proposed algorithms against attacks and the guarantee of control performance after applying security measures.For communication link elimination, we consider a group of agent switching from a fully connected communication network to a backup network with limited bandwidth due to attack. This problem is formulated as a linear quadratic Gaussian (LQG) team problem. We show that optimizing communication links in the backup network is equivalent to adding a cardianlity constraint to the original quadratic optimization problem. Due to the combinatorial nature of the problem, we apply convex relaxation on the constraint set and random projection on the objective function as dimensionality reduction tools. We provide the theoretical performance guarantee on the near-optimal solution obtained from the relaxed problem.For stochastic transmission against bus-off attacks, we present a mathematical model for the bus-off attack and formulate it as a non-zero sum game between the controller-transmitter pair and the attacker. A stochastic transmission policy is proposed as a proactive countermeasure when the attacker persists in the network. We determine the Nash equilibria of the non-zero sum game in the cases off open-loop and closed-loop attacker. To demonstrate the effectiveness of our theoretical results, we apply the stochastic transmission policy on an adaptive cruise control (ACC) and show that under the Nash equilibrium strategies, an appropriate stochastic transmission policy stabilizes the error counter and the ego vehicle maintains a safe distance with the leading vehicle.For dynamic watermarking against spoofing attacks, we extend the existing dynamic watermarking algorithm to a finite Markov decision process (MDP) setup. The watermark is added by changing the control policy of the controller. Compared with the linear/nonlinear model with dynamic watermarking, MDP model allows for more abstract elements (e.g., active and sleep) in the state and action space. Here, we propose a CUSUM-type detection scheme to detect whether the information coming from the feedback channel is authentic or has been compromised. We analyze the performance bound of the detection algorithm in terms of the detection delay and false alarms, and also the control loss due to introducing such watermarks into the system. We apply dynamic watermarking algorithm to detect a spoofing attack on a power management system in a sensor network. We demonstrate the trade-off between detection performance and control loss for different magnitude of the watermark applied to the system.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798845452498Subjects--Topical Terms:

649834
Electrical engineering.
Subjects--Index Terms:

CybersecurityIndex Terms--Genre/Form:

542853
Electronic books.

Cybersecurity for Networked Control System.
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504 $a Includes bibliographical references
520 $a This dissertation studies cybersecurity, with a focus on the control theory for cyber physical system (CPS). We consider CPS as a networked control system (NCS) where the sensing and control signals transmitted through the communication network can be compromised. To secure the NCS, we develop detection and response algorithms against adversarial attacks. In particular, we propose dynamic watermarking as an active detection scheme against sensor spoofing attacks, stochastic transmission of the control signals as a control response against bus-off (DoS) attack, and optimization on communication link elimination as a control response against general attack scenarios whenever network switching is needed. In all the cases, we show the efficacy of applying the proposed algorithms against attacks and the guarantee of control performance after applying security measures.For communication link elimination, we consider a group of agent switching from a fully connected communication network to a backup network with limited bandwidth due to attack. This problem is formulated as a linear quadratic Gaussian (LQG) team problem. We show that optimizing communication links in the backup network is equivalent to adding a cardianlity constraint to the original quadratic optimization problem. Due to the combinatorial nature of the problem, we apply convex relaxation on the constraint set and random projection on the objective function as dimensionality reduction tools. We provide the theoretical performance guarantee on the near-optimal solution obtained from the relaxed problem.For stochastic transmission against bus-off attacks, we present a mathematical model for the bus-off attack and formulate it as a non-zero sum game between the controller-transmitter pair and the attacker. A stochastic transmission policy is proposed as a proactive countermeasure when the attacker persists in the network. We determine the Nash equilibria of the non-zero sum game in the cases off open-loop and closed-loop attacker. To demonstrate the effectiveness of our theoretical results, we apply the stochastic transmission policy on an adaptive cruise control (ACC) and show that under the Nash equilibrium strategies, an appropriate stochastic transmission policy stabilizes the error counter and the ego vehicle maintains a safe distance with the leading vehicle.For dynamic watermarking against spoofing attacks, we extend the existing dynamic watermarking algorithm to a finite Markov decision process (MDP) setup. The watermark is added by changing the control policy of the controller. Compared with the linear/nonlinear model with dynamic watermarking, MDP model allows for more abstract elements (e.g., active and sleep) in the state and action space. Here, we propose a CUSUM-type detection scheme to detect whether the information coming from the feedback channel is authentic or has been compromised. We analyze the performance bound of the detection algorithm in terms of the detection delay and false alarms, and also the control loss due to introducing such watermarks into the system. We apply dynamic watermarking algorithm to detect a spoofing attack on a power management system in a sensor network. We demonstrate the trade-off between detection performance and control loss for different magnitude of the watermark applied to the system.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2023
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