Research On Multi-layer Data Privacy Scope Query Protocol Of Two-tiered Wireless Sensor Networks

Data query is the chief approach for wireless sensor networks to complete the tasks of monitoring and investigation.Therefore,this network is prevented from disclosing and manipulating information through the technology of data privacy protection,and finishes the tasks such as data query and access control by the technology of data management.Hence,it is very urgent and necessary to study the data query technology that is suitable for wireless sensor networks with privacy protection ability.Currently,to the research of data query technology for two-tiered wireless sensor networks,privacy protection range query is one of the studying hotspots that have attracted more attention.However,there are still some deficiencies in the privacy security or sensor nodes' energy consumption of these existing researches,and most of them are based on one-dimensional data.On the basis of this,this thesis conducts in-depth researches to the energy consumption and data privacy of multi-dimensional data range query,designs a multi-dimensional data range query protocol with privacy protection,and analyzes and verifies the security and energy consumption of the designed protocol.The major studying content involved in this paper is as follows:(1)Key exchange protocol: as low-power sensor nodes having limited computing capability and storage space,and wireless sensor networks boasting lower bandwidth and higher channel error ratio,a symmetric encryption algorithm of key management mechanism is created based on Diffie-Hellman encryption Key exchange protocol.Besides,the confidentiality of data transmission and storage is achieved based on AES lightweight data encryption algorithm;(2)With set two-tiered wireless sensor networks as the research object,the energy-efficient range query protocol of privacy protection multi-dimensional data is designed: as CSRQ(Communication-Efficient?Secure?Range?Queries)protocol based on 0-1 encoding involves so many problems,including long encryption constraint chain,large calculation on comparative factor,high energy consumption on communication,as well as only suitable for one-dimensional data range query and so on,the AES algorithm is adopted to construct an encrypted index chain to replace the lengthy encryption constraint chain and to lower the energy consumption of calculation and communication by applying the methods of optimized leftward 0-1encoding,HMAC operation,BASE64 encoding,so as to optimize compute mode ofcomparative factor.It realizes multi-dimensional data range query of sensor network's privacy protection,and verifies the authenticity and integrity to query results.(3)The Cortex-M4 core control chip and Alios Things operating system are employed to design wireless sensor networks nodes;The Cortex-A9 core control chip and the embedded Linux operating system are adopted to storage nodes;Taking them as an experimental platform,the designed protocol was transplanted and implemented in this platform,and the communication protocol was established to testify the functions of key exchange,submit and query as well as the authenticity and integrity verification of multidimensional privacy data;And compared with the CSRQ protocol,the energy consumption of this scheme reduced by about 21% compared with CSRQ under the same experimental environment.