Cryptology ePrint Archive: BibTeX Citation of Report 2014/503

@misc{cryptoeprint:2014:503,
    author = {Tran Viet Xuan Phuong and Guomin Yang and Willy Susilo},
    title = {Efficient Hidden Vector Encryption with Constant-Size Ciphertext},
    howpublished = {Cryptology ePrint Archive, Report 2014/503},
    year = {2014},
    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.