In this work, we present a fully-dynamic and very efficient solution to the key assignment problem that is also provably secure for a strong notion of security. We then show how the model can be extended to time-based policies where users obtain access rights only for a specific duration of time, and subsequently present our time-based key assignment solution. Finally, we explain how similar techniques can be used to efficiently enforce access control policies in geo-spatial systems and describe our construction for such systems as well.2 RELATED WORK 2.1 Key Assignment in Hierarchical Systems The first work that addressed the problem of key management in hierarchical access control was by Akl and Taylor . Since then a large number of publications ( [15a43] andanbsp;...
|Title||:||Key Management in Hierarchical Access Control Systems|
|Publisher||:||ProQuest - 2007|