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Multi-agent systems and mobile agents are enabling the deployment of applications in multi-domain environments. In these scenarios, different domains interact toward the same goal through resource sharing. As a result, there is the need to control the actions that an agent can perform in a foreign domain, with the only information of where it comes from and which roles does it hold in its own domain. However, this information will not be directly understandable as domains may not share the same role definitions.
MedIGS is a multi-agent middleware for the medical data sharing between hospitals which take part of a multi-domain environment. In this paper, a distributed access control for MedIGS is presented. Based on attribute conversion, this authorization scheme proposes a solution with a minimum impact in the local access control systems of the hospitals.

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