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Cloud storage services enable users to remotely store their data and eliminate excessive local installation of software and hardware. One critical issue is how to enable a secure data collaboration service including data access and update in cloud computing. A data collaboration service is to support the availability and consistency of the shared data among multi-users. In this paper, we propose a secure and efficient data collaboration scheme SECO. In SECO, we employ a twolevel hierarchicaldoi:10.1109/iwqos.2013.6550281 dblp:conf/iwqos/0001YLCXL13 fatcat:ut3n4uwspbhyhppcdk3jgawq5u