Abstract:  Aiming at the problems of limited scalability, inadequate security and permission allocation in traditional role-based access control (RBAC) models, in order to improve the compatibility of access control and refine the granularity of access control, this paper proposes a trust-based dynamic multi-level access control model (TBDMACM). TBDMACM guarantees data confidentiality and security of access process by obtaining corresponding authorization through the static roles and dynamic trust of users. The experimental results show that the proposed method can effectively prevent malicious access and better solve the problem of system privilege scalability.

Key words: access control, credibility, multi-level security