Cryptology ePrint Archive: BibTeX Citation of Report 2004/159

@misc{cryptoeprint:2004:159,
    author = {Gergely Acs and Levente Buttyan and Istvan Vajda},
    title = {Provably Secure On-demand Source Routing in Mobile Ad Hoc Networks},
    howpublished = {Cryptology ePrint Archive, Report 2004/159},
    year = {2004},
    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.