Cryptology ePrint Archive: BibTeX Citation of Report 2007/336

@misc{cryptoeprint:2007:336,
    author = {Onur Aciicmez and Werner Schindler},
    title = {A Major Vulnerability in RSA Implementations due to MicroArchitectural Analysis Threat},
    howpublished = {Cryptology ePrint Archive, Report 2007/336},
    year = {2007},
    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.