Temporary and domain role-based delegation model
具有时限性和区域性特征的基于角色转授权模型

Access control delegation model of distributed systems was researched in this paper.Role-based delegation model(RDM)is more suitable for distributed system environments,but current RDMs don't support temporal and domanial delegation.The domain feature of delegation was proposed firstly,which based on the character of distributed systems.A temporary and domain role-based delegation model(TDRDM)was presented,which was an extension of RDM2000 by supporting temporary and domain role-based delegation.The new mechanisms of delegation and delegation revocation were explored,which based on TDRDM.Finally,a model test was presented by an example of distributed system.As results,TDRDM not only ensures the time constraints,but also ensures the domain constraints of delegation in distributed system environments.