The Research On The Access Control Technology In Digital Library System

With the rapid development of information technology nowadays, more and more information needs to be saved and spread, at the same time, the information category and modality increase so much, obviously, traditional library which depends on books and periodicals can not satisfy requirements in Digital Times. Based on such background, digital library is born. Digital library is an electronic information data store, it can storage plenty of information with different format. Users can access it through network to get useful information, and it doesn't have location limitation in information storage and user accessing. Digital library is the production of digitizing and network, it is one of main standards to evaluate country's information infrastructure level, and it is an important section of society information construction, also it is the vital motivity to push knowledge economical developing. The appearance of digital library will bring new chance of library developing, it must play the main role in 21 century.During the digital library system building up, how to assurance the security of accessing should be especially considered. Because this will affect digital library developing progress. This article analyzes disadvantages in traditional accessing control technologies, and builds up a new module based on improving RBAC strategy, it is called RBAC based resource classes. This module mentions two new conceptions: Resource Classes and Independent Permission Logic. To assort resource classes can reduce workload of system administrator. The accessing permission table will use association between two independent entity tables, so Independent Permission Logic can avoid the system effects when accessing permission changed.There are six chapters in this article. Chapter 1 is the summary of article. Chapter 2 introduces the basic conceptions of digital library, functional modules, system constructure and key technologies. Chapter 3 analyzes traditional accessing control technology and RBAC module. Chapter 4 mentions new RBAC module based on resource classes. Chapter 5 is the analysis and implementation of new module. Chapter 6 summarizes all efforts and brings readers to a further research direction.