Research On Selective Encryption Algorithm For Vector Geographic Data Based On Geospatial Information

Vector geographic data has been widely used in surveying and mapping,navigation,military,planning and other fields.It is an important strategic resource for national infrastructure construction and national economic development.With the rapid development of computer technology and the arrival of 5G era,the distribution,transmission,storage and service of vector geographic data have become more and more convenient,and the online transmission,sharing and storage of data has become imperative.But at the same time,the characteristics of accurate location and high level of secrecy make the security problem of vector geographic data more prominent.How to realize the online transmission,sharing and storage of vector geographic data on the premise of data security is an urgent problem to be solved.Encryption technology,as the core technology in the field of information security,is an effective means to solve the security problems of vector geographic data.However,the existing encryption technologies mostly encrypt the vector geographic data in full text without considering the sensitivity of the data.Further,this will encrypt the part that can be made public,resulting in low encryption efficiency.Therefore,it is urgent to introduce new research ideas and methods to solve the contradiction between the efficiency and security of the existing vector geographic data encryption.Selective encryption technology developed in recent years provides a feasible way to solve the above contradiction.By analyzing the essential characteristics of vector geographic data and combining with the idea of measuring spatial information quantity,this paper studies the encryption feature selection method of vector geographic data considering spatial information quantity,and designs the selective encryption algorithm of vector geographic data based on encryption ratio calculation.This paper's main points are as follows:(1)Deeply analyze the characteristics of vector geographic data from the aspects of the type,organization structure and expression of vector geographic data.By studying data encryption technology,analyze the principle and main problems of selective encryption technology,and summarize the algorithm requirements of selective encryption technology of vector geographic data.(2)According to the requirement of efficient and secure encryption of vector geographic data,based on spatial information content theory and clustering idea,a method of feature selection for vector geographic data encryption considering spatial information content was proposed..In order to quantify the data encryption features,a computing method of vector geographic data encryption features is designed,and the existing spatial information calculation model is improved.Based on K-means clustering algorithm,the complexity level of elements is divided,which improves the dimension of data encryption feature analysis.Experiments show that the proposed encryption feature selection method of vector geographic data is reasonable,efficient and adjustable,and can effectively select the encryption features of vector geographic data.(3)Based on the established encryption feature selection method,a selective encryption algorithm for vector geographic data is proposed.In order to reduce the amount of data to be encrypted and improve the efficiency of the algorithm,the encryption data is selected based on one-dimensional Logistic chaotic system.Combined with the idea of scrambling-diffusion encryption,the scrambled encryption and coordinate value encryption are combined to encrypt the selected sequence to be encrypted by step,which effectively improves the ability of the algorithm against plaintext inference attack,solves the problem of unencrypted data exposure,and ensures the security of the algorithm.Experiments show that the proposed algorithm can only encrypt part of the data but change the whole mapping,which has high encryption efficiency and high security.