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The security models used in Grid systems today strongly bear the marks of their diverse origin. Historically retrofitted to the distributed systems they are designed to protect and control, the security model is usually limited in scope and applicability, and its implementation tailored towards a few specific deployment scenarios. A common approach towards even the "basic" elements such as authentication to resources is only now emerging, whereas for more complex issues such as community organization, integration of site access control with operating systems, cross-domain resource provisioning, or overlay community Grids ("Late authentication" for pilot job frameworks or community-based virtual machines) there is no single coherent and consistent "Security" view.
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