Key points are not available for this paper at this time.
We adapted the standard X.509 privilege management infrastructure to build an efficient role-based trust management system in which role assignments can be widely distributed among organizations, and an XML-based local policy determines which roles to trust and which privileges to grant. A simple Java API lets target applications easily incorporate the system. The Permis API has already proven its general utility in four very different applications throughout Europe.
Chadwick et al. (Sat,) studied this question.