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Controlling access to resources and services is fundamental to security. A variety of access control models have been developed over the years, each designed to address different aspects of the problem. This paper will examine the strengths and weaknesses of the various approaches as applied in a cross domain services and as implemented in common SOA frameworks. Please note, the access control mechanisms are discussed in this context and the comments are not general critiques of the advantages and disadvantages of the various systems.
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