Usage Control on Cloud systems.

Cloud Computing is becoming increasingly popular because of its peculiarities, such as the availability on demand of (a large amount of) resources, even for a long time. For this reason, Cloud Computing represents a good solution for those companies that want to outsource part of their software processes. However, Cloud Computing introduces new security and management challenges with respect to traditional systems exposed on the Internet. This paper presents an advanced authorization service based on the Usage Control model to regulate the usage of Cloud resources, focussing on IaaS services.