Cryptology ePrint Archive: BibTeX Citation of Report 2002/175

@misc{cryptoeprint:2002:175,
    author = {Dan Boneh and Craig Gentry and Ben Lynn and Hovav Shacham},
    title = {Aggregate and Verifiably Encrypted Signatures from Bilinear Maps},
    howpublished = {Cryptology ePrint Archive, Report 2002/175},
    year = {2002},
    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.