Research And Implementation Of Fine-grained Access Control About The Document On Mobile Terminal

Access control is one of the hotspots in the field of information security research.Compared with the traditional access control models,the encryption algorithm based on attribute can better ensure the data confidentiality and fine-grained access control.The thesis firstly summarizes the related works about access control tree based on attribute,pointing out the research thinking through comparative analysis.However,due to the following questions,the encryption algorithm based on attribute can not be applied to the actual scene: First,The efficiency of the mobile terminals.The computational overhead based on attribute encryption algorithm is very large and is not suitable to be applied to mobile terminals.Second,edit permissions of access control.Based on attribute encryption algorithm can not control the editing permissions of the document.Third,the dynamic access control.The attribute encryption algorithm can not achieve the function that the editing permissions of the document or access control change over time.To address these issues in attribute-based encryption algorithm,this paper includes the following aspects:(1)Aiming at the problem that the computational overhead of attribute encryption algorithm is very big.This paper proposes the fine-grained access control scheme based on ARM-ACT.The relationship between attributes in this scheme is a topological sort structure.The relationship between attributes can not have a ring.The scheme preprocesses the attribute before setting up the access control tree so that the number of attributes in the access control tree is reduced.The time-consuming of the decryption algorithm is linearly related to the number of attributes in the access control tree,so the performance of the scheme is better than that of other schemes and is more suitable to be applied to mobile terminals.(2)Aiming at the problem of access control of edit permission and dynamic access control,this paper proposes the fine-grained access control scheme based on TD-ACT and applies the scheme to the edit permission model.The main advantages of the schemes are reflected in the dynamic and edit permissions.Dynamic is reflected in the addition and revocation of attributes.The program has fine-grained control over the six edit permissions for modification,copying,cropping,pasting,sharing and printing.Finally,this paper realizes the mobile document management system based on the fine-grained access control model and tested the function of the system.By testing,the system meets the actual demand,and has a strong practicality.