Cryptology ePrint Archive: BibTeX Citation of Report 2004/244

@misc{cryptoeprint:2004:244,
    author = {Sherman S.M. Chow and Tsz Hon Yuen and Lucas C.K. Hui and S.M. Yiu},
    title = {Signcryption in Hierarchical Identity Based Cryptosystem},
    howpublished = {Cryptology ePrint Archive, Report 2004/244},
    year = {2004},
    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.