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The services provided in clouds may represent an increase in the efficiency and effectiveness in the operations of the enterprise business, improving the cost-effectiveness related to services and resources consumption. However, there is concern about the privacy of data, since such data are outside the client's domain. For these services to be effectively enjoyed by organizations it is necessary to provide access control. This paper is to provide identity management, based on digital identity federation, with authentication and authorization mechanisms for access control in cloud computing environments to independent, trusted third-parties.
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