The Research On Sink Location Privacy Protection Algorithm Based On Virtual Circle And Perpendicular In WSN

With the rapid development of sensor technology and embedded technology,the microsensor has the ability of sensing,computing and communication.A network composed of a large number of sensors is called wireless sensor network,which has attracted extensive attention in the fields of environmental monitoring,disaster warning,traffic management,animal protection,emergency rescue,national defense and military affairs.WSN integrates technologies such as sensor technology,embedded technology and communication,it can transmit the information of monitoring object to the sink in data packet by multi-hop communication mode.However,the shared transmission channel is easy to be tracked and monitored by adversaries,which leads to serious privacy disclosure problems.WSN privacy is mainly divided into content data privacy and location privacy.Data content privacy refers to that the adversary controls the sensor nodes in the network and steals or tampers the packet content transmitted by the sensor nodes by monitoring the link layer,it mainly uses communication control and network anonymity technology to complete data query,access and control tasks under the condition of hiding sensitive information.Location privacy mainly includes location privacy of source node and sink node,the adversary eavesdrops on the signal of the transmission data packet in the network,determining the location of source node or sink node by tracking source of the data packet hop by hop.Sink location privacy protection is very important in WSN,sink is the only node that receives data from all sensors in the sensor network,it is an important research direction for protecting the sink-location privacy nowadays.So,sink location privacy protection algorithm based on virtual circle and perpendicular are put forward.For the problem of low safe time of existing sink location privacy protection algorithm,sink location privacy protection algorithm based on perpendicular is put forward.This algorithm randomly determines a line according to the location of the source node and a point in the region where the coordinate axis is fixed,and randomly selects a point on the line as the first expected phantom source node.The vertical line is established through the first expected phantom source node,and the second expected phantom source node is randomly selected on the vertical line to provide the direction for data transmission.The experimental results show that compared with other sink location privacy protection algorithms,our safe time is significantly improved.For the problem of low safe time of existing sink location privacy protection algorithm,sink location privacy protection algorithm based on virtual circle is put forward.The algorithm establishes a virtual circle with the sink as the center,and establishes a corresponding mathematical model to determine expected phantom source nodes according to the different positions of source nodes,making the first stage phantom source nodes more evenly distributed.Through angle-based directed circumferential routing,the second stage phantom source nodes distributed more dispersedly.The setting and analysis of deploying fake sink show that by randomly selecting the angle on the external region of the divided virtual circle and using the normal distribution mathematical model to determine the distance between the fake sink and the sink,the location of the fake sinks satisfies randomicity and dispersity.The experimental results show that the algorithm can effectively induce adversaries to deviate from the real path and improve the safe time.