Group Key Management And Secure Opportunistic Routing Protocol Of Wireless Mesh Network

Wireless Mesh Network is a type of new proposed wireless network structure. Wireless Mesh Network has got advantages of multi-hop, self-organized, high capacity, high speed and self-recovery, thus it is being deeply researched and widely applied.The common routing protocols applied to WMN are improved routing protocols, which are reformed from presented Ad Hoc network routing protocols to new routing protocols that fit WMN better, according to WMN characteristic.Because WMN belongs to both wireless local network and Ad Hoc network, it possesses security threats from both sides. The usability, data reality, communication secrecy and information integrity of WMN are facing threaten.Aiming at features of WMN, this paper proposed new hierarchical architecture of WMN, as well as authentication and authorization proposals. New WMN architecture contains Internet gateways, wireless mesh routers and wireless mesh clients. Every mesh router and several mesh clients managed by it make up a sub group. With the group, mesh router takes responsibility of group key management. Mesh router allocates public and private keys as well as sub key based on threshold secret sharing schema for every mesh clients.This paper integrates Lagrange Interception Polynomial and elliptical curve public cryptography algorithms to be one multicast key management proposal which has more security and efficiency capacity. The proposal employs network encoding technique for key management communication to gain higher transfer speed while forwarding key management information.Opportunistic routing protocol is new-borne routing technique designed for wireless network, which take advantages of broadcasting and packet loss. Opportunistic routing exploits full of data transfer capability of wireless radio and enlarge network throughput. However, opportunistic routing lacks of security mechanism and is facing critical threaten. This paper works out a new communication protocols with embedded security mechanism based on opportunistic routing which is used for data transfer among mesh clients of same sub group. Secure schema ensures secrecy of data communication while enhancing network throughput and transfer speed. The results of simulations indicates that the new group key management proposal base on threshold secret sharing and elliptical curve public cryptography has got better encryption intensity while improving network capacity on contract of RSA schema. Routing protocol based on opportunistic routing and network encoding increases data throughput of WMN to great extent compared to improved Ad Hoc routing protocols.As a new developing direction, wireless mesh network is in rapid development and being spread used. Research on WMN architecture, group key management, data communication routing protocols and corresponding security techniques has got essential theoretical and practical significance. The architecture and secure communication schema proposed by this paper, have increased data transfer capacity and secrecy of WMN to some extents. In the future research, the secure proposals and routing protocols should be further improved. More perfect WMN should be designed with improvement of network throughput as well as other capacity indicators while secrecy is ensured.