Cryptology ePrint Archive: BibTeX Citation of Report 2007/326

@misc{cryptoeprint:2007:326,
    author = {Jun Shao and Zhenfu Cao and Licheng Wang and Rongxing Lu},
    title = {Efficient Password-based Authenticated Key Exchange without Public Information},
    howpublished = {Cryptology ePrint Archive, Report 2007/326},
    year = {2007},
    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.