Cryptology ePrint Archive: BibTeX Citation of Report 2012/216

@misc{cryptoeprint:2012:216,
    author = {Duong-Hieu Phan and David Pointcheval and Siamak F. Shahandashti and Mario Strefler},
    title = {Adaptive CCA Broadcast Encryption with Constant-Size Secret Keys and Ciphertexts},
    howpublished = {Cryptology ePrint Archive, Report 2012/216},
    year = {2012},
    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.