Abstract:

To reduce the possible threats of users’ behavior, improve the security of cloud computing system, and ensure the dynamic access control, this paper proposes an access control model based on the trust value assessment of cloud computing. The model determines the level of trust and completes the authorization process by dynamically computing the integrated trust value of the user’s behavior. Considering the interaction characteristics of user behavior factors, the model introduces the theory of analytic network process on the basis of establishing the complete trust value evaluation model, which can realize the objective weight distribution of user behavior factor and improve the reliability and objectivity of the model. The attenuation factor is added in the model to further ensure the dynamic change of the integrated trust value of users’ behavior, so that the user can gain the dynamic access and this improves the security of cloud environment. This paper expounds the structure of model, composition elements, implementation process and strategies of access control. And at last the experimental results show that the model can achieve dynamic, secure and reliable access control in cloud environment.

Key words: cloud computing, access control, trust value, dynamic authorization