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Cross-Cloud federation implies the establishment of a trust context between cloud platforms acting on different administrative domains and located in different places. The main advantage of federation is that clouds can set inter-domain communications so that they can benefit of new business opportunities such as the enlargement of their virtual resources capability. The process of federation set up can be schematized in three subsequent phases: Discovery, Match-Making, and Authentication. In this paper, considering several clouds based on both the CLEVER architecture and a Cross-Cloud Federation Manager module, responsible for the accomplishment of the three phases, the authors focus on the authentication phase required for a secure interaction between different CLEVER domains.
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