Cryptology ePrint Archive: BibTeX Citation of Report 2005/043

@misc{cryptoeprint:2005:043,
    author = {Hsiao-Ying Lin and Wen-Guey Tzeng},
    title = {An Efficient Solution to The Millionaires' Problem Based on Homomorphic Encryption},
    howpublished = {Cryptology ePrint Archive, Report 2005/043},
    year = {2005},
    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.