@inproceedings{li2013fine,
  title={Fine-grained access control system based on outsourced attribute-based encryption},
  author={Li, Jin and Chen, Xiaofeng and Li, Jingwei and Jia, Chunfu and Ma, Jianfeng and Lou, Wenjing},
  booktitle={European Symposium on Research in Computer Security},
  pages={592--609},
  year={2013},
  organization={Springer}
}