Key Generation Scheme Based on RIS Multipath Random Superposition
In static scenario,the multipath phase and amplitude changes slowly,and the key rate at physical layer based on wire-less channel characteristics is low,making it difficult to meet the communication security requirements of high-speed data ser-vices.This paper proposes a key generation scheme based on random superposition of multipaths with the help of RIS.Firstly,both the sender and the receiver use the real-time controllability of the RIS and the agile characteristics of the pattern to separate the multipath in the space through the multipath power spectrum characteristics.Then,the power allocation strategy of multipath is changed many times in the channel coherent time,an equivalent fast-changing channel is constructed,and the randomness of the key source is improved.Finally,a consistent security key is generated through quantization,negotiation,and privacy amplification.Simulation results show that,compared with the existing physical layer key generation schemes based on RIS antenna,the pro-posed scheme improves the source entropy by exploiting the multipath characteristics of the channel.On the other hand,the ran-domness of the source is improved by the power distribution on the multipath,which brings a certain gain to the key rate.
万方数据
维普
