Outer system flow privacy protection

Nowadays, social networks, information networks and technological networks have already become main media of information publication and exchange. Meanwhile, the information diffusion in these networks is well studied. However, most privacy protection technologies, e.g., access control, have not considered the influence of these networks systematically. In this paper, a concept of outer system flow privacy control is proposed. In addition, system privacy requirements are reconsidered. Furthermore, in user case, role base access control (RBAC) is analyzed and improved based on the outer system flow control.