Research On Physical Layer Encryption Technology Based On Wireless Channel

In recent years,wireless communication network technology has been widely used in China,which has brought tremendous changes to the way people work and daily life.Everyone is fully enjoying the dividends brought by the development of modern wireless communication and network technology.At the same time,due to the broadcast nature of the wireless media and the openness of the network,the signal is completely exposed to the external interference environment,and it is extremely vulnerable to secret interception and malicious attacks by illegal elements.This hidden danger to network security poses a serious threat and impact on the protection of personal information privacy and the normal operating order of modern society.Due to the complexity of wireless communication networks and the open nature of wireless links,complex upper-layer network encryption password algorithms are also very It is difficult to effectively implement in complex mobile wireless communications and Internet networks.Traditional cryptography-based security strategies have gradually failed to meet the security management needs of today's mobile Internet information era.In addition,the computing power of supercomputers is increasing day by day,and even encryption mechanisms with large computational loads are at risk of being compromised.And the management and use of keys are also easily limited by the transmission rate of the broadband transmission control system.Even if the length of the key is increased or the space of the key is expanded,it is difficult to fundamentally avoid being cracked by exhaustive eavesdroppers.In response to the above problems,this thesis extracts the physical characteristics of the channel in the wireless channel and generates the key.After key negotiation,the keys generated by both parties of the communication are completely consistent.Then,both parties in communication use the generated key to design the interleaving matrix,which is used to encrypt the information.In the case of interleaving matrices generated with different quantization keys,the bit error rate of the system is studied.The main research work of this paper is as follows:(1)The characteristics of the encoding and encryption technology of the interleaving key of the physical layer of the wireless channel are studied in depth.The physical layer wireless channel interleaving technology and the wireless channel physical layer encryption technology are organically combined,and a joint interleaving encryption method based on the physical layer key of the wireless channel is designed to carry out the physical layer data information of the OFDM system.Encryption and randomization processing improve the security and reliability of wireless channel information transmission.(2)Aiming at the situation where long consecutive 0 or long consecutive 1 may appear in the physical layer key,the original interleaving matrix is transformed to avoid the situation of long consecutive 0 or longconsecutive 1,and an improved algorithm for generating encrypted interleaving matrix is given.The system bit error rate of two interleaving matrix generation algorithms is simulated and analyzed,and their performance is compared.(3)The effects of physical layer keys under different physical layer quantization methods on the performance of the wireless channel interleaving encryption algorithm are studied,and pure amplitude,pure phase,and amplitude-phase joint quantization methods are studied for the characteristics of the wireless physical layer channel.Through computer simulation,the system performance of the physical layer key quantized by different2-bit quantization methods is analyzed and researched,and a better performance physical layer interleaving encryption scheme is obtained,thereby providing a reasonable basis for the widespread use and development of wireless channel interleaving encryption algorithms Basis and recommendations.