Cryptology ePrint Archive: BibTeX Citation of Report 2011/229

@misc{cryptoeprint:2011:229,
    author = {Md. Golam Kaosar},
    title = {Routing Protocol Based Shared and Session Key Exchange Protocol for Wireless Mobile Ad-hoc Network },
    howpublished = {Cryptology ePrint Archive, Report 2011/229},
    year = {2011},
    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.