Research On Smart Device-Oriented Access Control Model For Vector Geospatial Data

Vector geospatial data is an important part of national geographic information resources.Its security is not only related to the smooth development of the geographic information industry,but also to the public interest and national security.With the rapid development of Mobile Internet,working with vector geospatial data in mobile smart device is becoming more and more common.Access control is a key strategy for data’s security protection,which prevents unauthorized access to resources and provides technical means for the active protection of vector geospatial data.There are many well-established theories in the traditional field of access control.However,traditional access control models cannot be directly applied to mobile application scenarios of vector geospatial data because of its special data structure and the dynamic application environment.Therefore,it is essential to study smart device-oriented access control for vector geospatial data.In this paper,we use the traditional access control theories for reference,and focuses on the research of vector geographic data access control for smart device according to the characteristics of vector geographic data and mobile application scenarios.The main contents include:(1)The special characteristics of vector geospatial data are analyzed,and the attacks on vector geospatial data in a mobile environment are described.The demands for vector geospatial data access control in smart device are summarized and the mobile access control framework for vector geospatial data is proposed.It can indicate the direction for further research.(2)We proposed an improved map method based on Tent map,and this method is used in vector geospatial data scrambling.Based on affine transformation,a reversible coordinate deviation algorithm for vector geospatial data is designed.By combining scrambling and deviation,a selective encryption algorithm is proposed for the spatial and attribute characteristics of vector geospatial data.The experimental results show that this selective encryption algorithm has better efficiency and security,and can maintain the stability of the geographical scope,which is applicable for the fine-grained access control in a mobile environment.(3)This paper proposes an access control model named Dynamic Trust-Based Access Control for Vector Geospatial Data(VGD-DTBAC)combined with selective encryption algorithm.The evaluation index of the model is established for dynamic trust,and the corresponding quantification method is also proposed.In order to describe the basic logic of the model implementation,a VGD-DTBAC process framework is provided,from which the access control process is extracted.The access control model and process provide the basis for system implementation and model verification.(4)Based on VGD-DTBAC,a fine-grained access control system for Shapefile data under the Android platform is established which can achieve access control process protection for vector geospatial data in a mobile environment.The results show that VGD-DTBAC is valid,which can effectively allocate permissions,authenticate permissions,evaluate trust,implement the fine-grained access control and prevent attacks during the access control process.