Research On Privacy Protection In Wireless Sensor Networks

In recent years,with the continuous development and progress of computers,sensors,wireless communications and embedded technologies,the production cost and communication energy consumption of micro-sensors have been further reduced.The sensor nodes have the ability to sense the monitoring target,calculate and analyze the collected data,and communicate with other sensor nodes.The sensor nodes are deployed in the monitoring area through random or artificial methods,and a distributed multi-hop self-organizing wireless sensor network is formed through wireless communication.Wireless sensor networks have the characteristics of large-scale networks,strong dynamics,high reliability,specific applications and data-centricity,and have been widely used in defense and military,system control and environmental monitoring areas.However,sensor nodes have some limitations in terms of computing power,storage capacity,and their own energy resources,which leads to many problems in deployment.In addition,the issue of privacy protection largely affects using and large-scale deployment of the wireless sensors.In the thesis,the problems of location privacy leakage and data privacy tampering in the process of wireless sensor network data transmission are analyzed and researched on.The main research contents are as follows:Aiming at the problem of source node location privacy protection,a random direction phantom routing privacy protection protocol algorithm in WSN is proposed.First,the range of candidate regions of the phantom node is randomly selected through the first two random orientation selections,and randomly selected the current phantom node within the candidate regions in the algorithm.Then,in order to ensure the lowest energy consumption during transmission the sensing data,the sensing data is transmited in wireless and multi-hop method through the improved minimum energy consumption routing protocol in the algorithm.Finally,according to the geographic location information of the current phantom node,the sensing data obtained by the sensor node is forwarded to the phantom node selected by the data source node in the current round,then,the sensing data obtained by the sensor node is forwarded and collected to the Sink node by the current phantom node.In the above steps,the path diversity of sensing data transmission is guaranteed,and data source node location privacy information is protected effectively.For the problem of querying data privacy scope,a two-layer sensor network order preservation symmetric range query protocol algorithm is proposed.The fuzzy range query stage and precise range query stage is mainly included in the algorithm.First of all,based on the exact query range,the scope of the query according to the particularity of the application is expanded in the fuzzy range query stage,and initially implements the filtering of the sensing data.At the same time,the unit grouping flag is added during the query process to specify the grouping range of the query unit so as to avoid unnecessary data query work and waste of additional network energy resources.Then,the fuzzy query results uploaded to the storage node in the fuzzy range query phase is more rigorously queried in the precise range query stage and the query results is sended to the Sink node.To encrypt the data during the data query phase and the transmission process the order-preserving symmetric encryption algorithm is used in the algorithm,which ensures the privacy of the sensing data transmission process.At the same time,the multi-hop forwarding sense data is adopted within the unit packet,using the improved minimum energy consumption routing protocol.Finally,through the simulation platform TOSSIM in TinyOS and MATLAB,the proposed algorithm is simulated and compared.The experimental results show that the algorithm proposed for location privacy and data privacy is more effective and reasonable than the existing algorithms in terms of privacy protection and network energy consumption.