Research On Trust Based Access Control In Cloud Computing Environment

Today, with the rapid development of internet technology, computing technology and other information technologies, could computing represents an emerging business computing model that is one hot problems of information technology research at present and has been attracting more and more attention, which is the development of distributed computing, peer-to-peer computing and grid computing. Cloud computing security issues and challenges become a restrict factor of cloud computing development. Access control is one of the important technologies to solve the security issues of cloud computing, because cloud computing environment has the characteristics of dynamic, open, massive expansion and automatic resource allocation, to a certain extent it puts forward higher requirements for the access control technology used in cloud computing.Based on the research of traditional access control, this paper analyzes the access control application requirements of cloud computing environment, proposes a model for trust-based access control in cloud computing environment- TBACCCE. This paper presents an algorithm for the evaluation algorithm of behavior trust based on fuzzy-EABTBF by using the theory of analytic hierarchy process, which improves the accuracy of behavior trust evaluation, reduces algorithm complexity and shortens processing time.The algorithm establishes a link between the historical behavior trust and the current behavior trust by introducing the decay factor decrease. This paper designs an updating mechanism of behavior trust according to the sliding window principles, which uses event- driven method and ensures that the behavior trust can be accurately updated in real time,and develops a trusting relationship between cloud users and cloud service providers to reduce the possibility of malicious attacks or service and provide security for cloud computing environment. By grading the behavior trust and roles, this paper sets the permissions that different roles and designs authorization rules in TBACCCE, and proposes a new dynamic permission adjustment mechanism in order to meet the dynamic management control requirements that cloud computing system demands, which is based on the evaluation of behavior trust and the setting of authorization rules.In the end, this paper designs a simulation system, which realizes behavior trust evaluation, behavior trust update, permission adjustment and access control functions. The TBACCCE model is verified by different access requests, the testing results verify that TBACCCE proposed above can provide secure and reliable access control for cloudcomputing environment.