Secure Consensus Control of Multiagent Systems Under DoS Attacks: A Switching-Scheme-Based Active Defense Method.

Area of Science:

• Control Theory
• Networked Systems
• Cybersecurity

Background:

• Multiagent systems (MASs) face challenges in maintaining consensus under denial-of-service (DoS) attacks.
• Existing defense mechanisms often have limitations regarding attack duration and frequency.

Purpose of the Study:

• To develop a secure consensus control strategy for MASs with a nonzero input leader under DoS attacks.
• To propose an active defense method that ensures leader-follower bound consensus despite communication disruptions.

Main Methods:

• Introduction of backup topologies for active defense against DoS attacks.
• A novel active defense method comprising state observers, adaptive topology switching, and switching controllers.
• Utilizing a predefined performance index and monitoring function to select healthy communication graphs.
• Employing linear matrix inequalities to derive universal observer and controller parameters.

Main Results:

• The proposed defense scheme effectively ensures leader-follower bound consensus under DoS attacks.
• The method removes limitations on the duration and frequency of DoS attacks.
• The consensus error bound remains consistent before and after DoS attacks.

Conclusions:

• The developed defense scheme offers a robust solution for secure consensus control in MASs.
• The approach demonstrates superior performance and efficiency compared to existing methods.
• Simulation examples validate the effectiveness of the proposed theoretical results.