Abstract
Middleware influenced the research community in developing a number of systems for controlling access to distributed resources. Nowadays a new paradigm for lightweight integration of business resources has started to hold Business Processes for Web Services. Authorization and access control policies for Web Services proto- cols and distributed systems are well-studied and standardized, but there is not yet a comprehensive proposal for distributed access control architecture. This paper surveys the available approaches and analyzes them for a better understanding of what these systems have and what they still need to address the security challenges.
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