Cryptology ePrint Archive: BibTeX Citation of Report 2004/102

@misc{cryptoeprint:2004:102,
    author = {Benoît Libert and Jean-Jacques Quisquater},
    title = {The Exact Security of an Identity Based Signature and its Applications},
    howpublished = {Cryptology ePrint Archive, Report 2004/102},
    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.