Cryptology ePrint Archive: BibTeX Citation of Report 2003/168

@misc{cryptoeprint:2003:168,
    author = {Jean-Camille Birget and Dawei Hong and Nasir Memon},
    title = {Robust discretization, with an application to graphical passwords},
    howpublished = {Cryptology ePrint Archive, Report 2003/168},
    year = {2003},
    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.