RPRDM: A Repeated-and-Part-Role-based Delegation Model

Role based delegation model （RDM） is more suitable for delegation in distributed environments First, the essence and necessity of repeated role delegation （RRD） and part role delegation （PRD） are analyzed Then, a repeated and part role based delegation model （RPRDM）, a new RDM, is presented, and the model’s definition and delegation/delegation revocation rules are given Finally, a prototype of RPRDM on Linux is implemented