@misc{cryptoeprint:2013:208,
    author = {Yi-Ruei Chen and Cheng-Kang Chu and Wen-Guey Tzeng and Jianying Zhou},
    title = {CloudHKA: A Cryptographic Approach for Hierarchical Access Control in Cloud Computing},
    howpublished = {Cryptology ePrint Archive, Report 2013/208},
    year = {2013},
    url = {http://eprint.iacr.org/2013/208},
}