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In Cloud computing, the data are not only managed by the data owner but also by Cloud providers. Sophisticated Clouds collaboration scenarios require that these data objects can be accessed distributively among Cloud providers, while still being under the control of data owners. It brings security challenges for distributed authorization and trust management in which existing proposed schemes have not fully solved. In this paper, we propose a Dynamic Trust Establishment approach which candoi:10.1109/cloudcom.2012.6427548 dblp:conf/cloudcom/NgoDL12 fatcat:pm3lice3rzddhaqyvlninq6m7m