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As the low maintenance, cloud computing supply and capable solution for sharing group resource within cloud users. Sharing data with the two or more owners while preserving data and identity privacy from an un-trusted cloud is still an issue, due to the frequent change of the membership. In this paper, the authors propose a secure data sharing scheme for dynamic subgroups in the cloud. By using group signature and dynamic broadcast encryption techniques, only privileged cloud user can store and share data.
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