Cryptology ePrint Archive: BibTeX Citation of Report 2013/535

@misc{cryptoeprint:2013:535,
    author = {Sujoy Sinha Roy and Junfeng Fan and Ingrid Verbauwhede},
    title = {Accelerating Scalar Conversion for Koblitz Curve Cryptoprocessors on Hardware Platforms},
    howpublished = {Cryptology ePrint Archive, Report 2013/535},
    year = {2013},
    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.