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- [2] Accountable authority key policy attribute-based encryption[J]. WANG YongTao 1,2 ,CHEN KeFei 1,3 ,LONG Yu 1,4 & LIU ZhaoHui 2 1 Department of Computer Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;2 China Information Technology Security Evaluation Center,Beijing 100085,China;3 Shanghai Key Laboratory of Scalable Computing and Systems,Shanghai Jiao Tong University,Shanghai,200240,China;4 State Key Laboratory of Information Security,Graduate School of Chinese Academy