Doctoral thesis (Dissertations and theses)
CYBERSECURITY OF CRITICAL INFORMATION INFRASTRUCTURE AND CONTROL: APPLICATION-AWARE RESILIENCE MECHANISMS
MATOVIC, Aleksandar
2024
 

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Keywords :
Resilient Cybersecurity; Critical Infrastructure Protection; Adaptive Threat Defense; Fault Tolerance; Resilience Mechanisms; Cyber-Physical Systems (CPS)
Abstract :
[en] In an era of growing cyber threats, where critical infrastructure such as power grids, healthcare systems, and transportation networks are increasingly targeted by sophisticated attacks, the urgency of designing resilient cyber-physical systems (CPS) has never been more pressing. Cyber-physical systems form the very backbone of our modern society, and their disruption can have catastrophic consequences, ranging from economic losses to threats to human life. Against this background, this thesis addresses two fundamental challenges in the field of CPS: firstly, enhancing resilience against a wide range of threats by leveraging application knowledge to improve on the costs of resilience, ranging from accidental system failures to carefully coordinated cyber-attacks, and secondly, ensuring the adaptability of these systems in the face of dynamic and unpredictable operational environments. The first challenge addressed is the improvement of system resilience. We introduce novel Consensual Resilient Control (CRC) method to systematically convert stateful control tasks into statelessly recoverable ones, by leveraging consensually updated shared state introduced in the thesis is central to this challenge. CRC significantly improves the performance of control task replication by exploiting the inherent stability of many systems to tolerate occasional missed control task deadlines. This approach rejuvenates replicas within each control cycle, improving system resilience and operational efficiency. This not only enables rapid recovery but also significantly reduces the overheads associated with traditional replication methods, particularly in environments prone to cold start effects. The effectiveness of CRC is not just theoretical, but demonstrated through practical applications, such as our implementation in the custom-built inverted pendulum system, which demonstrates the robustness of the CRC in unpredictable environments and its ability to efficiently maintain system resilience with fewer resources. The second challenge is to ensure system adaptability in the face of changing operational conditions. To this end, the thesis presents the A GIS architecture, a solution that seamlessly integrates dual control systems to optimise performance while maintaining safety. The adaptive nature of A GIS is particularly beneficial in open environments where CPSs are exposed to a wide range of disturbances. The architecture’s minimal switching overhead and its utility in complex tasks such as environmental monitoring illustrate its practical importance in enhancing system robustness
Disciplines :
Computer science
Author, co-author :
MATOVIC, Aleksandar ;  University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > CritiX
Language :
English
Title :
CYBERSECURITY OF CRITICAL INFORMATION INFRASTRUCTURE AND CONTROL: APPLICATION-AWARE RESILIENCE MECHANISMS
Defense date :
26 July 2024
Number of pages :
121
Institution :
Unilu - University of Luxembourg [Faculty of Science, Technology and Medicine], Luxembourg
Degree :
DOCTEUR DE L’UNIVERSITÉ DU LUXEMBOURG EN INFORMATIQUE
Jury member :
LENZINI, Gabriele ;  University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > IRiSC
FRIDGEN, Gilbert  ;  University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > FINATRAX
Maggio Martina;  Lund University > Control Department
Marcus VÖLP;  Unilu - University of Luxembourg [LU] > Snt, Critix
Gerhard Fohler;  TU Kaiserslautern
Focus Area :
Security, Reliability and Trust
Development Goals :
9. Industry, innovation and infrastructure
Available on ORBilu :
since 23 September 2024

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