Cryptology ePrint Archive: BibTeX Citation of Report 1999/019

@misc{cryptoeprint:1999:019,
    author = {Johan Hastad and Mats Naslund },
    title = {Security of all RSA and Discrete Log Bits   },
    howpublished = {Cryptology ePrint Archive, Report 1999/019},
    year = {1999},
    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.