Cryptology ePrint Archive: BibTeX Citation of Report 2012/370

@misc{cryptoeprint:2012:370,
    author = {Renaud Dubois and Aurore Guillevic and Marine Sengelin Le Breton},
    title = {Improved Broadcast Encryption Scheme with Constant-Size Ciphertext},
    howpublished = {Cryptology ePrint Archive, Report 2012/370},
    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.