Cryptology ePrint Archive: BibTeX Citation of Report 2013/462

@misc{cryptoeprint:2013:462,
    author = {Qingji Zheng and Shouhuai Xu and Giuseppe Ateniese},
    title = {VABKS: Verifiable Attribute-based Keyword Search over Outsourced  Encrypted Data},
    howpublished = {Cryptology ePrint Archive, Report 2013/462},
    year = {2013},
    note = {\url{http://eprint.iacr.org/}},
}

You will need the url.sty package (comes with most LaTeX installations) for the last line. Otherwise, remove the \url command.