A Key Management Research Based On Polynomial For WSN

With the continuous development and application of wsn, the security of wsn has become increasingly prominent.Due to the special environment of deployment and limited resources of the nodes in wireless sensor network. So it is quite different from the traditional wireless network. In security solutions, encryption technology is the foundation. For the encryption, key management is critical. Due to the problem that it is difficult for network security、communication overhead and network connectivity to achieve balance in the existing key management schemes, this scheme has proposed two improved schemes:a trivariate symmetric polynomial key management scheme based on key establishment node and a trivariate symmetric polynomial key management scheme based on routing-driven for WSN.The trivariate symmetric polynomial key management scheme based on key establishment node introduces the key establishment nodes, which store a trivariate symmetric polynomial associated with its own an identifier. In the key negotiation process, key establishment node is responsible for key agreement between cluster head node and ordinary node as well as base station is responsible for key negotiation between cluster head and cluster head. But fewer resources of the cluster head node and ordinary are not involved in the negotiaton process. Simulation results show that this scheme not only can improve the anti-capture ability and but also effectively reduce the energy consumption in the key negotiation phase.During the key negotiation phase, a trivariate symmetric polynomial key management scheme based on routing-driven for WSN adds the routing information so that the node establishs communication key with neighbour sensors that communicate each other, not all physical neighbor node. So it can reduce the number of key establishment. Making up a random bivariate symmetry polynomial by putting random numbers into trivariate symmetry polynomial can increase the difficulty of break the polynomial. Simulation results show that the scheme in the context of high network connectivity rate and smaller memory overhead, it can effectively reduce energy consumption and enhance the network security.The two schemes have reference value for key management research, especially for some high security and low energy consumption requirem-ents of applications.