@misc{cryptoeprint:2013:755,
    author = {Qi Li and Jianfeng Ma and Rui Li and Ximeng Liu and Jinbo Xiong},
    title = {Improving security and efficiency for multi-authority access control system in cloud storage},
    howpublished = {Cryptology ePrint Archive, Report 2013/755},
    year = {2013},
    url = {https://eprint.iacr.org/2013/755},
}