Cryptology ePrint Archive: BibTeX Citation of Report 2011/318

@misc{cryptoeprint:2011:318,
    author = {Sujoy Sinha Roy  and  Chester Rebeiro  and   Debdeep Mukhopadhyay  and  Junko Takahashi  and  Toshinori Fukunaga},
    title = {Scalar Multiplication on Koblitz Curves using $\tau^2-$NAF},
    howpublished = {Cryptology ePrint Archive, Report 2011/318},
    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.