International Journal of Computer Applications
Access control is a fundamental and essential mechanism to maintain security in Ubiquitous Computing (UbiComp). Flexibility is an important property for general access control system, which can be achieved by access or authority delegation. Existing delegation mechanisms are \"Subject-centered\", thus in order to make sure that the unavailability of some users does not prevent the system to be functional; auto-delegation mechanisms are introduced, in particular for emergency-prone environments, such as healthcare, military systems auto-delegation mechanisms are required. Auto-delegation mechanism combines the strengths of delegation systems and \"Break-the-glass\" policies, by stating that the most qualified available user for a resource can access this resource.