Unix is an operating system that began development almost 40 years ago. It has a very simple mechanism for controlling access to protected resources based on the owner-group-world model. This simple model has not attracted much interest from the access control community. In this paper we argue that the Unix access control mechanism has some interesting features of relevance to modern authorizat...

This paper introduces a formal model, an architecture and a prototype implementation for usage control on GRID systems. The usage control model (UCON) is a new access control paradigm proposed by Park and Sandhu that encompasses and extends several existing models (e.g. MAC, DAC, Bell-Lapadula, RBAC, etc). Its main novelty is based on continuity of the access monitoring and mutability of attrib...