Design And Implementation Of Secure Device Communication System Based On Wireless Channel Characteristics

In the field of smart home,wireless communication is usually adopted with the advantages of easy to deploy and large capacity to access devices,among which Wi-Fi communication technology with high popularity is the most widely used.Smart home systems typically include a remote server,numerous sensor terminals deployed throughout the home,and a gateway devices that act as communication bridges between remote server and sensor terminals.Due to the openness of Wi-Fi communication technology,wireless communication between gateway and sensor cannot resist traffic analysis attacks and side channel attacks.Attackers can obtain users'environmental data and even gain control of devices in the residence through traffic analysis attacks,which brings great threats to users' privacy.In order to enhance the security of this communication system and ensure the privacy of users,this paper proposes a device security communication system based on wireless channel characteristics,which can resist traffic analysis attacks and improve the security of communication system under the condition of limited resources such as equipment operation,storage and power consumption.The main work are as follows:(1)Aiming at the Wi-Fi communication technology and its interaction protocol,the hidden security space is fully explored,and a hidden frame format compatible with the current protocol is proposed.The frame includes 14 bits of storage with the highest security,the body of the frame can store data of general privacy,and can support up to 2312B data transmission.By using this hidden frame format,the hidden transmission of important data can be completed without attracting the attention of attackers,and the security of key source and communication system can be improved.(2)Deeply study the guiding ideology of physical layer security,point out its shortcomings,and design a set of secure communication system based on wireless channel characteristics.This system absorbs the advantage of using natural property of wireless channel as the key source in physical layer security,and removes the complicated work to improve the symmetry of the key source.(3)Verify the correctness,security and feasibility of the secure device communication system mentioned in this paper from the perspective of theoretical proof and experimental verification.In the theoretical proof,the key source security,key security and equipment security are expounded.During the system development,two Hi-Link 7628 development boards were used to complete the system development and construction,which proved the feasibility of the system through tests.