A Dynamic Cross Domain Access Control Model for Multi-level System

Aiming at the problem of illegal access in cross domain access control in multi-level system, this paper proposes a D-BLP dynamic cross domain access control model by improving the BLP access control model. The set of secure labels is used to track the information flow in the system to ensure that the information can't be flowed to non-authorized subjects. Finally, the security of the model is proved by using the non-interference theory.