Research On Key Distribution And Sybil Detection In Wireless Sensor Network

Wireless Sensor Network (WSN) is a network communication system whichformed by a large number of sensor nodes in the form of self-organizing, as the coretechnology of Internet of Thing perception layer, to obtain the targets’ information atany time, any place, and any environment, and widely used in intelligent power,intelligent transportation, medical and rescue, battlefield perception and other fields.Compared with the traditional wired network, Wireless Sensor Network often bedeployed in harsh environment, and the sensor nodes hardware resources aregenerally limited. Therefore, how to guarantee the network’s security has become animportant topic in the research of Wireless Sensor Network, This article discuss thesecurity of the wireless sensor network from the security system establishment andalteration, pointed out the shortcomings of the present study, and do someimprovement. The main contributions of this paper are as follows.(1) In the stage of security system establishing. The existed key Pre-distributionschemes normally have two problems, one is the nodes need to store a lot of keys; theother is the security connectivity rate and the ability of Network Anti-destroying can’tdoing well at the same time. In order to solve these problems, a key Pre-distributionscheme is put forward based on the information of the nodes deployment. The schemedivides the whole area into many squares. On the one hand, by keep the degree ofoverlap between the sub-domain, reasonable setting the size between the key ring andkey pool, improve the probability of two nodes sharing the same key in a small area,enhance the network security connectivity rate; On the other hand, use the Hashfunction irreversibility, improve the network’s ability to resist various attacks; Avoiddiagonal adjacent sharing keys, control the number of partitions of each area adjacent,improve the ability of the network anti-destroying. Simulation experiments show thatthe nodes only need to pre-allocate few key and the network can achieve high securityconnectivity rate, at the same time, reduces after the nodes were captured exposure inproportion to the communication link, the security and network connectivity rate anti-destroying ability of harmony.(2) In the stage of security system alteration, this paper mainly discusses theSybil attack. The existed Sybil attack detection scheme usually need high qualityhardware, have significantly affected by environments, consume big energy, and dobad under high density of nodes. In order to solve these problems, this article putsforward a Sybil attack detection scheme based on distance measurement. Unliketraditional distance measurement schemes, This scheme does not measure allneighbor nodes, but using the change of the number of neighbor as the constraintcondition to measure distance, on a small scale, Nodes use the improved SDS-TWR(Symmetric Double Sided-Two Way Ranging，SDS-TWR) method to measure therelative position, detection the Sybil node. Simulation experiments show that thescheme have a good detection rate under both high and low density of nodes, reducethe energy consumption of the network.