Cryptology ePrint Archive: BibTeX Citation of Report 2004/091

@misc{cryptoeprint:2004:091,
    author = {Einar Mykletun and Maithili Narasimha and Gene Tsudik},
    title = {Signature Bouquets: Immutability for Aggregated/Condensed Signatures},
    howpublished = {Cryptology ePrint Archive, Report 2004/091},
    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.