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User privacy has been a major concern against the widespread adoption of the cloud technology. A full-fledged cloud data service should effectively support data utilization tasks, especially flexible data search functionalities, while simultaneously achieve user privacy assurance and meet practical system-level performance requirements. In this position paper, we identify the importance and challenges of designing privacyassured, flexible and practically efficient search mechanisms fordoi:10.1109/icdcsw.2012.41 dblp:conf/icdcsw/LiYLH12 fatcat:etuikjcsv5dgbgoiya7rkms5je