Research And Application Of Anonymous Communication Protocol Based On Directed Diffusion Routing

Wireless sensor networks(WSNs)are confronting severe challenges since the limited energy and the deteriorating network environment.Attackers impersonate legitimate users to access WSNs,compromise internal nodes,or intercept plaintext transmitted on the public channel,these attack behaviors prejudice the network extremely.Scholars at home and abroad have made extensive work in the security of WSNs,but they often focus on a single attack.Therefore,to resist the above three attack behaviors,this thesis designs a security mechanism by implementing identity authentication of communication entities,routing establishment of relay nodes,and confidential transmission of plaintext.The main contributions are as follows.(1)A new anonymous identity authentication and key agreement protocol in WSN is proposed.Aiming at the identity counterfeiting problems when users access WSNs,and the privacy leakage of plaintext transmitted on the public channel,this thesis proposes an anonymous identity authentication and key agreement protocol based on the dynamic sequence and shared secret value.Utilizing the dynamic sequence,shared secret value,and dynamic random numbers,the protocol realizes anonymous identity authentication and session key agreement among users,gateway,and sensor nodes.The session key is utilized to encrypt plaintext data in the later data propagation phase for secure communication between users and WSNs.The security analysis and performance analysis show that the proposed protocol has low computation,storage,and communication overhead on the premise of security and users' anonymity.(2)A trust-based secure directed diffusion routing protocol is proposed.Given the unreliability of nodes in the network and the privacy risks of data transmission in plaintext in the directed diffusion protocol,this thesis proposes a trust-based secure directed diffusion routing protocol.Initially,an energy trust model is constructed and applied to the directed diffusion routing protocol.The energy trust model considers the node's direct trust and the remaining energy,thereby obtaining the node's energy trust by weighting.The proposed protocol selects relay nodes to establish paths according to the energy trust,effectively eliminating malicious nodes.Besides,a secure key distribution method based on the D-H protocol is proposed and applied to the directed diffusion routing protocol for the key distribution between the gateway and relay nodes.The distributed keys are applied for encryption in the data propagation phase to realize confidential data transmission.Performance analysis and simulation analysis show that the protocol can balance network energy consumption to a certain extent on the premise of meeting the security and nodes' anonymity.(3)A directed diffusion routing-based anonymous communication prototype system is implemented.To further verify the effectiveness of the proposed anonymous authentication protocol and secure directed diffusion routing protocol,the front-end adopts Bootstrap+JS+j Query technology and the back-end utilizes the Django framework to implement a directed diffusion routing-based anonymous prototype system.The prototype system implements functions such as user identity authentication,information query,directed diffusion routing,network management,and user modification.The prototype system ensures the security and anonymity of users when accessing and managing the wireless sensor networks.