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The new paradigm of outsourcing data to the cloud is a double-edged sword. On the one hand, it frees data owners from the technical management, and is easier for data owners to share their data with intended users. On the other hand, it poses new challenges on privacy and security protection. To protect data confidentiality against the honest-but-curious cloud service provider, numerous works have been proposed to support finegrained data access control. However, till now, no schemes candoi:10.1109/tsc.2017.2682090 fatcat:vclsys4rx5fprohwqt474u3qaa