Cryptology ePrint Archive: BibTeX Citation of Report 2007/127

@misc{cryptoeprint:2007:127,
    author = {Vanesa Daza and Javier Herranz and Paz Morillo and Carla R\`afols},
    title = {CCA2-Secure Threshold Broadcast Encryption with Shorter Ciphertexts},
    howpublished = {Cryptology ePrint Archive, Report 2007/127},
    year = {2007},
    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.