Cryptology ePrint Archive: BibTeX Citation of Report 1999/020

@misc{cryptoeprint:1999:020,
    author = {Silvio Micali and Leonid Reyzin },
    title = {Improving the Exact Security of Digital Signature Schemes },
    howpublished = {Cryptology ePrint Archive, Report 1999/020},
    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.