@misc{cryptoeprint:2012:192,
    author = {Liangliang Xiao and I-Ling Yen and Dung T. Huynh},
    title = {Extending Order Preserving Encryption for Multi-User Systems},
    howpublished = {Cryptology ePrint Archive, Report 2012/192},
    year = {2012},
    url = {http://eprint.iacr.org/2012/192},
}