A key management scheme based on grouping within cluster

In research of Optimization of performance of wireless sensor networks to improve anti-attack capability, key management is an important security issue to be solved. Due to the severe restriction on resources and work environment, the classic key distribution algorithms are not suitable for wireless sensor networks. Aiming to improve the capability of security and feasibility of wireless sensor networks, after considering the issues of network security, traffic problems, memory problems and computational complexity problem, this paper proposes a key management scheme based on grouping within cluster to solve the problem of poor salability, low work efficiency and communication times . This scheme makes a big improvement of group key generation method. Cluster heads and group heads in the clusters are respectively used to generate and distribute keys via secure channels in each group. The simulation results show that this scheme further improves network´s ability to resist DOS (denial of service) attack, reduces the energy consumption and time consumption in key negotiation and improves the survival time and efficiency of entire network.