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Ciphertext-Policy Attribute-base Encryption (CP-ABE) is regarded as one of the most suitable technologies for data access control in cloud storage. In almost all existing CP-ABE schemes, it is assumed that there is only one authority in the system responsible for issuing attributes to the users. However, in many applications, there are multiple authorities co-exist in a system and each authority is able to issue attributes independently. In this paper, we design an access control framework fordoi:10.1109/icdcs.2012.42 dblp:conf/icdcs/YangJ12 fatcat:qmle6fdx65a4zjsordaay6tuyy