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Cloud storage service allows data owner to host their data in the cloud and through which provide the data access to the users. Because the cloud server is not trustworthy in the cloud storage system, we cannot rely on the server to conduct data access control. To achieve data access control on untrusted servers, traditional methods usually require the data owner to encrypt the data and deliver decryption keys to authorized users. In these methods, however, the key management is verydoi:10.1145/2484313.2484383 dblp:conf/ccs/YangJR13 fatcat:dnz6dv4fujhjbb43oihzbfoluu