Key Management Scheme For Wireless Sensor Network

Wireless Sensor Network (WSN) is a new kind of information acquisition andprocessing technology,widely used in military,ecological environment monitoring,traffic management,medical health monitoring,space detection,etc,having the significant influence to the human way of life.While sensor networks are oftendeployed in noone supervision and uncontrollable complex environment,so the WSN is not onlyfaced with all kinds of security threats such as information manipulation,replay attackand so on,also faces the threat that the sensor node captured by a attacker and thentampers with the node information,so as to control the part of the other networks.Therefore,the security problem of WSN is a research hot topic,as well as key manage-ment is the basis of realizing the WSN’s security mechanism.In view of the characteristics of sensor networks,such as batteries,limited calcula-tion ability and communication distance,small storage capacity,and so on,the traditio-nal key management techniques such as public key encryption system,based on theauthentication center security system is no longer applicable.It is avery good choice touse key predistribution technology,namely before deploying the sensor nodes,first loa-ding a certain amount of key information into the memory of sensor nodes,both sidesof communication gaining key through these information.In order to meet the specialneeds of WSN,this paper does the following works for some security problems of wir-eless sensor networks:(1) Firstly,this paper simply introduces the system structure of wireless sensor ne-twork, the composition of the sensor node and the characteristics of the wireless sens-or network, and analyses the security problems faced with wireless sensor network.Secondly,it does a simple comparison and analysis for the existing typical key manag-ement scheme for wireless sensor network,and especially makes a detailed introdu-ction and analysis for the typical scheme of random key predistripution and clustertype key management.(2) Due to the based on bivariate symmetric polynomials of random key predistri-bution scheme has the problem of threshold properties, scheme one using commontrivariate polynomial to build communication among nodes, and one-way functionwas used to process the shared key to increase the dificulty of cracking keys. Mean- while,hexagon-based deployment mode was employed toenhance the safe connectivi-ty rate of the network,and reduce the range that is influenced by the captured nodes.The analytical results show that this scheme hashigher anti-destroying ability and sec-urity,and also reduces the overhead of communication among nodes.(3) Through the research on establishing sharing key scheme using symmetricbinary polynomial in the multidimensional space,the second scheme makes improve-ment for some shortages of the original scheme,optimizes the dynamic path found al-gorithm and add the part of key updating and the initial key.The analysis results showthat the improved scheme is more safe in communication.