Survey On Secure Communication Based On Wireless Channel Characteristics

With the advent of quantum computers,the security of communication under public-key cryptography system which is based on computational complexity has been challenged.Besides,the secure communication based on traditional symmetric key encryption has the problem of storage and distribution of pre-shared keys.Because of the reciprocity of wireless channels,the wireless channel characteristics can be used as a random source for symmetric key generation.While avoiding the problem of key distribution,it provides”one time pad”secure communication,which has become a research hotspot.The secure communication scheme based on the reciprocity of the wireless channel is mainly composed of two parts:physical-layer based key generation(PKG)and secure transmission.This paper mainly studies the information reconciliation phase in PKG.In addition,in order to simplify PKG secure communication,a scheme of un-identical key-based physical-layer secure transmission(UK-PST)is proposed..The main research work and innovative research results of this paper are as follows:1)A comprehensive evaluation metric for information reconciliation is proposed to conduct a more comprehensive analysis of reconciliation performance.After classifying and summarizing the existing reconciliation schemes,it is found that the error detection pro-tocol based approaches(EDPA)and the error correction code based approaches(ECCA)have advantages and disad-vantages in information leakage bit rate(LBR),interaction delay,and computational overhead.In order to make up for the defect of existing reconciliation evaluation metric-the reconciliation efficiency,which only considers LBR,a unified expression which includes three influencing factors of LBR,interaction delay and computing overhead is established,which is called comprehensive information reconciliation evaluation metric.Its physical meaning is the number of bits effectively reconciled in the unit time,so as to compare the various information reconciliation schemes more comprehensively.2)A hybrid information reconciliation protocol(HIRP)which aims at improving the comprehensive reconciliation efficiency is proposed.Taking BBBSS protocol and BCH code as examples in EDPA and ECCA respectively,HIRP algorithm is proposed to combine the advantages of the two,which mainly includes three steps of training,table look-up and test.Under the comprehensive information reconciliation evaluation metric,Monte-Carlo simulation proves that the reconciliation performance of HIRP protocol is superior to both BBBSS and BCH when the bit disagreement rate of initial keys(?)is in the range of[0.5%,11.5%].When?=2.5%,the comprehensive information reconciliation evaluation metric of HIRP is 3.7 times of BBBSS,2.6 times of BCH code.3)A scheme of un-identical key-based physical-layer secure transmission(UK-PST)is proposed to simplify the secure communication process.To avoid the PKG process in identical key-based physical-layer secure transmission(IK-PST),UK-PST is proposed,which considers the difference between the initial keys and the transmission error of public channel as a whole to reconcile and correct errors.It is proved by theory and simulation that UK-PST is superior to IK-PST in terms of communication overhead,computational complexity and security transmission rate.With the rise of?,the gap between security transmission rate of UK-PST(R_UK)and security transmission rate of IK-PST R_IKbecomes wider.In addition,in the 6 communication scenarios implemented on the Zigbee wireless platform,R_UKis always higher than R_IK.When there is no pedestrian in the room and the two nodes are 1.5m away from the line of sight,?=0.74%,R_{U K}is 1.5 times of R_IK.And when there are pedestrians in the corridor and the two nodes are 3.5m away from not the line of sight,?=3.77%,R_{U K}is 1.08 times of R_IK.4)Expanding the point-to-point UK-PST to physical-layer based secure communication between multiple users and increasing the secure transmission rate of secure communication within the group.The UK-PST scheme is extended to the group communication of N users with a star network topology and a chain network topology respectively.It is theoretically proved that in the above two network topologies,UK-PST is superior to IK-PST in terms of number of transmissions,number of reconciliation and secure transmission rate.Simulation results show that when the bit disagreement rate of initial group keys?_q=0.05,R_UKis 1.15 times of R_IKin the case of the same number of users.Experimental results show that R_UKis 1.5 times of R_IKin a star network of 6 users.And in a chain network,R_UKis 1.15 times of R_IK.