Resilient Control of Cyber-Physical System Using Nonlinear Encoding Signal Against System Integrity Attacks

TLDR

The paper proposes an attack‑resilient control architecture for cyber‑physical systems to defend against stealthy integrity attacks that alter plant states without detection. The approach employs nonlinear encoding/decoding with chaotic oscillators to detect attacks, maintain nominal performance, and secure inter‑layer communication, and its resilience under delays and nonlinearities is demonstrated through simulations on a quadruple‑tank process.

Abstract

In this article, we propose an attack-resilient control structure for a cyber-physical system (CPS) to enhance the CPS security against stealthy system integrity attacks that manipulate the state of the physical plant while undetected. With the help of nonlinear encoding/decoding components, the proposed structure can detect stealthy attacks and preserve the nominal performance without considering attacks. Meanwhile, for avoiding the eavesdropping of transmitted signals used to synchronize encoding/decoding components between the physical and cyber layers, the chaotic oscillators are employed for the secure communication. The resilience against the malicious attacks and the robustness under the time delay and nonlinear components of the proposed CPS structure are investigated in view of input-to-state stable framework. Simulations for quadruple-tank process are performed to validate the performance of the proposed method.