A dynamic Access Control model based on trust

Since Role-Based Access Control (RBAC) shows great advantage in meeting the security need in large-scale and enterprise-wide system, RBAC becomes the hot topic in access control research field. However, current approaches to access control are mostly based on individual user identity; hence they do not scale to distributed systems. So, the paper analyses RBAC could not satisfy dynamic access control in distributed environment, and puts forward an dynamic access control model based on roles and trust control, giving every trust value for each user by introducing trust management to access control, each role corresponds a certain trust vale, users and systems give values for each other after operation, trust management modesties and updates trust values, users roles will change accordingly, The experiment shows that the model is much validated, and something useful is obtained. The extended model can meet the need to manage and enforce the strong and efficient access control technology in large-scale environments. The flexibility and broad application of the proposed model through the system is testified and something useful is obtained.