@INPROCEEDINGS{5201385, author={Cong Wang and Qian Wang and Kui Ren and Wenjing Lou}, booktitle={2009 17th International Workshop on Quality of Service}, title={Ensuring data storage security in Cloud Computing}, year={2009}, volume={}, number={}, pages={1-9}, doi={10.1109/IWQoS.2009.5201385}}