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Today, the challenge in security of complex distributed systems does not anymore lie in encryption or access control of a single middleware platform, but in the protection of the system as a whole. This includes the definition of correct security policies at various abstraction layers, and also in the unified and correct management and enforcement of the correct security policy at all relevant places in the system. The authors have learned in the development even of comparatively simple distributed systems that this is not possible anymore by a manual definition of encryption properties and access control rules.
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