Cryptology ePrint Archive: BibTeX Citation of Report 2004/320

@misc{cryptoeprint:2004:320,
    author = {Alfonso De Gregorio},
    title = {Upper Bounds for the Selection of the Cryptographic Key Lifetimes: Bounding the Risk of Key Exposure in the Presence of Faults},
    howpublished = {Cryptology ePrint Archive, Report 2004/320},
    year = {2004},
    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.