Research On Secure Technology Of Spatial Data Transmission For Mobile Terminal

Geospatial data plays an important role in economic construction and national defense construction.With the emergence and widespread use of mobile terminal devices and mobile application software,the security threat of spatial data on mobile terminal is more prominent.The rapid development of mobile GIS system needs the support of massive geospatial data.Some sensitive data cannot be transmitted directly in mobile network.However,the existing spatial data encryption technology has some problems such as slow encryption speed and large amount of computing resources.Therefore,it is of great social value and practical significance to study the security technology of spatial data transmission for mobile terminal.In order to reduce the security threats of geospatial data in mobile terminal,based on the characteristics of spatial data model,the demand of mobile spatial data encryption and the characteristics of mobile applications,this paper studied the encryption technology of geospatial data in mobile terminal.The effectiveness of data encryption and the efficiency of encryption algorithm are tested through experiments,and the feasibility of spatial data security technology for mobile terminal is verified by developing a prototype system.The specific research work and conclusions are as follows(1)The Logistic chaotic mapping algorithm is selected and improved as the main algorithm of spatial data encryption in mobile terminal.By analyzing the structure and characteristics of spatial data and the encryption requirements of mobile spatial data,the Logistic chaotic mapping algorithm is selected to be suitable for mobile spatial data encryption.By expanding the range of parameter values and selecting the decimal part of the calculated value to participate in the iteration,the classical Logistic chaotic mapping algorithm is improved to solve the limitations of small key space and uneven distribution of iterative sequence values,which greatly increases the size of key space,makes the distribution of iterative sequence values more uniform,and improves the security of encryption algorithm.(2)A spatial data encryption method for mobile terminal is designed and implemented.For vector data,firstly,the storage structure of geometric information is optimized and compressed.Secondly,the attribute information and the transformed geometric information are compressed by gzip code,and the symmetric encryption method is used to encrypt based on the improved Logistic chaotic mapping algorithm;for raster data,the pixel features are extracted and the image format is maintained,and the improved Logistic chaotic mapping algorithm is used to encrypt.Combined with the key management and distribution method,the detailed steps of spatial data encryption are given,and the encryption effect and operation efficiency of the algorithm are verified and discussed.The experimental results show that the encryption efficiency of the proposed encryption algorithm is nearly three times of that of AES algorithm under the same security performance.(3)The key management and distribution methods are studied and designed.The prototype system is designed based on the model of secure communication system.Symmetric encryption,public key encryption and password based encryption are applied to the construction of the prototype system.The key management and distribution methods are fully considered and designed in the function modules of user management,data encryption and data access.(4)The existing mobile application development technologies are compared.By analyzing the advantages and disadvantages of native app,web app and cross platform app development mode,and comparing the technical parameters of several cross platform mobile application development frameworks,xamarin mobile development framework is selected to realize the development of the prototype system.At the same time,it discusses the ways,methods and technical means of building mobile application information security,combs the key technologies of network data transmission security,and puts forward the security points of application development.