Security Synchronization for Complex Cyber-Physical Networks Under Hybrid Asynchronous Attacks

This paper investigates the synchronization of complex cyber-physical networks (CCPNs) under hybrid asynchronous attacks. Firstly, a kind of hybrid asynchronous attack model consisting of DoS attacks in sensor to controller (S-C) channel, DoS attacks in controller to actuator (C-A) channel and connection attacks is proposed, which is a new generalization of traditional synchronous attack model. Secondly, a distributed controller using two combinational measurements of node states and sensor outputs is designed to obtain the synchronization criteria of CCPNs under hybrid asynchronous attacks. Then, two methods are proposed to ensure that all nodes of CCPNs are synchronized based on the designed distributed controller. Meanwhile, the duration time and frequency of attacks that the systems can tolerate are calculated. Finally, two examples are given to illustrate the effectiveness of the proposed method.