Improvements In The Security Structure Of The Grid Computing System

Grid is a rising technology developed in recent years, it becomes an increasingly important field of research. Grid resources have the characteristics of changing dynamically, widely distributed, enormous quantity types, so grid computing concerns more security problems than any other common problems, and a lot of new security problems have appeared in the grid environment .So the research of grid security has become a very important, complex and tough job.This article first introduces the grid technology elementary knowledge and the grid security requirements, the security policies and so on; thoroughly analysis the grid security infrastructure inadequacies of the GSI, against unauthorized access and abuse of agents has been improved, introduces the intermediary module between the user agent and the resources proxy, simultaneously, in the improvement GSI structure, considers the efficiency of the resources, proposes the grid tree topology, and describes applied for the grid resources in this structure of the process; Has discussed the grid safe access control strategy , in view of the GSI access control strategy insufficiency, proposes based on the Agent access control strategy model, has analyzed basic principle and the process of this model; Earnestly has studied the Open Security Technical Framework (OpenSTF), describes its overall structure, the security middleware as well as the distributional core, proposes five requests of the grid computing system security architecture, according to these requests, has designed a five-story structure of the security system, and the security middleware has been deployed into the security system structure, then it has better scalability; Finally unifies this system structure, draws out one kind of stratified grid computing system security architecture model, and has carried on the comparison with the original OGSA security framework.By these discussion and research, this paper presents a few grid secure solutions from theory. It is a reference and direction for research and development of grid secure technology in the future.