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Cloud computing is a revolutionary computing paradigm which enables flexible, on-demand and low-cost usage of computing resources. However, those advantages, ironically, are the causes of security and privacy problems, which emerge because the data owned by different users are stored in some cloud servers instead of under their own control. To deal with security problems, various schemes based on the Attribute- Based Encryption (ABE) have been proposed recently. However, the privacy problem ofdoi:10.1109/infcom.2013.6567070 dblp:conf/infocom/JungLWW13 fatcat:uxiike6lxravjek4kgt3cxcrsu