Cryptology ePrint Archive: BibTeX Citation of Report 2009/350

@misc{cryptoeprint:2009:350,
    author = {Harikrishna Narasimhan and Venkatanathan Varadarajan and C. Pandu Rangan},
    title = {Game Theoretic Resistance to Denial of Service Attacks Using Hidden Difficulty Puzzles},
    howpublished = {Cryptology ePrint Archive, Report 2009/350},
    year = {2009},
    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.