Research Of Key Management Mechanism Of WSN Based On Deployment Knowledge

Wireless sensor network is composed of micro-sensor nodes through self-organized manner.Those nodes are of limited energy and communication range, weak storage and data-processing capacity and limited range of wireless communications.It has already widely applied to each field in life extensively.So it is necessary to design the wireless sensor network security scheme to meet practical application.Key management is the most important part and the most emergency problem to solve in wireless sensor network security issues,and it's the crucial issue to ensure data secure transmission between nodes.Pre-distribution is a popular key distribution system,in which the key pre-distribution based on node disposition is approbated widely.At present,most of advanced key pre-distribution scheme based on node disposition always manage nodes by packet processing,neglect the connectivity of block-bodes and interblock-nodes. Moreover,these schemes had huge occupancy internal storage and contradiction of memory-flow in network with network security.Some schemes are unsuitable in large-scale network for feeblish extendibility.For the defect of key management system,the main studying content including:Firstly,designed a key-function chain pre-distribution mechanism,in which neighbor nodes figure out their shared key in use of two shared key-function,transfer information which is encrypted and decrypted by bilinear pairing of ECC,realized authentication function of information and nodes,prevented manipulation of information and node-forgery attack.Secondly,bring forward the determinant method of critical nodes between groups. Each node could reduce key-function chains storaged on itself by the domain overlaid. Therefore,the scheme could assure the same connectivity of networks and reduce memory wastage of nodes. Thirdly,carved up the aim domain in orthohexagonal mode to not only reduce key-function chains storaged on nodes,but also settle domain's jointless overlay by used of a small quantity of nodes.By the analysis of simulation experiment,the scheme could reduce memory wastage of nodes,assure the same connectivity of interblock nodes and block nodes,advance extendibility of network and reduce energy expenditure of nodes.