Cryptology ePrint Archive: BibTeX Citation of Report 2009/538

@misc{cryptoeprint:2009:538,
    author = {Johann Gro{\ss}sch{\"a}dl and Elisabeth Oswald and Dan Page and Michael Tunstall},
    title = {Side-Channel Analysis of Cryptographic Software via Early-Terminating Multiplications},
    howpublished = {Cryptology ePrint Archive, Report 2009/538},
    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.