The Research On Source-Location Privacy Protection Algorithm Based On Node Distance And Fake Source In WSNs

Wireless sensor networks(WSNs)is an important part of the Internet of Things.WSN has the potential to be widely used in many areas,such as military,medical services,disaster warning,wildlife protection and so on.Wireless sensor network comprises of a large number of cheap,small,and resource-constrained sensors which are able to monitor the physical phenomena occurring in their vicinity.These sensor nodes can communicate the sensed information hop-by-hop in the distributed network.With the help of WSN,people can acquire a lot of real and reliable information at any time,any place and any environment.In the wireless sensor network for target monitoring,the node closest to monitored target is considered as source node.The exposure of source node threats to the security of the monitored target seriously.Therefore,the physical location privacy protection of source node has become a crucial question.The paper analyzed the existing wireless sensor network privacy protection algorithms.For the problems in existing wireless sensor network privacy protection algorithms,the paper proposes source-location privacy protection algorithm based on node distance and source-location privacy protection algorithm based on false source.The phantom source nodes generated by the phantom routing algorithm are near to the real source node easily.Adversary can find out source node by tracing back hop by hop which decrease the safety period of the network.In order to solve these problems,source-location privacy protection algorithm based on node distance is put forward.The algorithm selects the transition node randomly between maximal transmission hops and minimum transmission hops,calculates the distance from transition node to previous hop node and the line equation of the two nodes.The node in the line is regard as expect phantom source node which its distance to transition node is K times greater than the distance of transition node and previous hop node.Expect phantom source node provides direction for selecting phantom source node.Theoretical analysis shows that the algorithm can select multiple phantom source nodes which are away from source node.The experimental results show that the algorithm can improve safety period with the little increase of communication cost.For the problem that source node exposed easily because of local adversary and the energy cost is heavy in the algorithm based on flooding,source-location privacy protection algorithm based on fake source is put forward.With neighbor information,the algorithm determines the shortest path of packets transmission.And the algorithm selects intermediate node and sensory node on it.With the help of environmental sensory ability,sensory node sends message to the nearest upriver intermediate node when sensed adversary in the network.The intermediate node received message floods with h hops,selects the fake source node which send fake packets to intermediate node.The experimental results show that the algorithm can prevent the adversary from tracing back to source node,lead adversary away from true path effectively,achieving the purpose of increasing safety period and the source-location privacy.