3.6. Conclusion
In this chapter, we have discussed the main notions and models for access control and presented extensions that are relevant in the context of distributed systems. It is important to emphasize that in addition to what has been discussed in this chapter, the research field is very active in the area of access control for distributed systems, and many relevant research directions are being investigated. A relevant direction is represented by access control for grid computing systems and virtualized environments. Those systems and environments are quite challenging because of the very large number of users and distributed administration of resources. In particular, they are characterized by the fact that there is no single authority ...
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