Research On Mixed Key Management And Intruder Detection Of Wireless Sensor Networks

Wireless Sensor Network(WSN) is a mufti-hop ad hoc network, which are made up of many cheap, lower power micro-sensor nodes with sensing capability, limited computation capability, data processing capability and wireless communication capability. WSN has a large range of application including national security, traffic management, medical research and environment protection, so becomes one of research hot-spots around the world. With the development of WSN and its industrialization, its security issues get more and more attention.Because of its limited energy, low computing speed, limited communication capability and small memory, WSN is significantly different from traditional wireless networks in the security design. Because of its poor work environment, most of the environment is no man zone and vulnerable to damage, the requirement of node security, information confidentiality and integrity are relatively high.This paper puts forward the security requirements of WSN, lists the possible existence of security risks problem. Base on the group key and pairwise key, this paper designs a mixed key management scheme, which has a smaller computational cost and a strong anti-capture capability, effectively improve the security of wireless sensor network.Base on the analysis of the possible invasion of WSN, this paper designs a Probabilistic Intrusion Detection System Model. In this model, we propose the kdetection model by analyzing the sensing radius, the number of sensors deployed in the network and the speed of intruder movement. At last, the thesis summarizes the whole content and makes an expectation on the development of the system in the future.