Research On Group Secret Key Generation Scheme Of Physical Layer Based On Circle Topology Network

Recently,the secret group key generation based on physical layer security and information theory security has attracted increasing research interest.Compared to the traditional encryption and security mechanism,physical layer security encryption technology generates keys by using randomness,uniqueness and reciprocity of wireless channel,rather than depends on the complexity of the encryption algorithm.This feature makes the physical layer security technology more suitable for the limited computing power and limited power consumption scenarios,such as wireless sensors network.However,the broadcast characteristics of wireless channel and the complexity of network topology will undoubtedly make the research of physical layer security technology face more challenges.This paper studies the physical layer key generation technology basesd on wireless channel characteristics,and summarizes the advantages and disadvantages of the current physical layer group key generation scheme under different network topologies.On this basis,a group key generation scheme based on circle topology is proposed.In order to verify the performance of the scheme,this paper analyzes the maximum group key generation rate of the scheme in the presence of eavesdropper by using the knowledge of information theory,and then carries out the simulation.Simulation results show that the proposed scheme not only assigns computation and broadcast tasks to each node,but also significantly improves the group key generation rate compared with the benchmark scheme which is based on star topology.Finally,the influence of the number of nodes and the signal-to-noise ratio on the rate of group key generation is further analyzed.It is also analyzed that using more channels in the network to generate group keys does not necessarily improve the rate of group key generation.