Cryptology ePrint Archive: BibTeX Citation of Report 2008/238

@misc{cryptoeprint:2008:238,
    author = {S.Sharmila Deva Selvi and S.Sree Vivek and Ragavendran Gopalakrishnan and Naga Naresh Karuturi and C.Pandu Rangan},
    title = {On the Provable Security of Multi-Receiver Signcryption Schemes},
    howpublished = {Cryptology ePrint Archive, Report 2008/238},
    year = {2008},
    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.