A trust-role access control model facing cloud computing

Focusing on the issue of user access security against cloud computing mode and on the base of traditional role-based access control model, a trust-role based access control model T-RBAC is proposed by the combination of trusted mechanism and role. The model owns independent trust management center which could first of all judge user credibility before role mapping and permission granting. If user's credibility doesn't reach the threshold value, the user would not receive the permission for resource access. Such would effectively prevent potential damage from illegal attack launched by such user as owns relatively minor credibility, effectively ease network congestion, enhance the ability to resist interference and the throughput of the access control model, shorten network delay and improve system efficiency to some extent.