A fixed-time synchronization-based secure communication scheme for two-layer hybrid coupled networks

Abstract

This literature mainly investigates the fixed-time synchronization-based secure communication issue with two-layer hybrid coupled networks, which consist of multitudinous subnets with different transmittal time-delays. By the application of appropriate cluster strategy, the subnets, in both transmitter and receiver, make up several matched subnet-pairs (encryption/encryption units). The nodes may behave different dynamics in different subnet-pairs but identical ones in the same subnet-pair. Similar to the block encryption method, every matched subnet-pair is merely in charge a portion of information encryption/decryption. Many encryption/encryption units working simultaneously can manifest the intricate characteristics of nodes and increase the encryption/decryption rate. Fixed-time synchronization is applied, which means that the time for information encryption/decryption is computable. Moreover, the chaos message, generated by a chaotic system, is taken as a key array, the key space will be enlarged with node-size at transmitter. With the design of some suitable chattering-free feedback controllers, a simple fixed-time synchronization-based secure communication scheme is given and the effectiveness is proved. This scheme shows not only good performance with regard to the complexity of key arrays and timeliness but also excellent robustness to the effect of time-delays. Both the theoretic analysis and numerical emulations indicate the feasibility and utility of the given scheme.