Cryptology ePrint Archive: BibTeX Citation of Report 2009/400

@misc{cryptoeprint:2009:400,
    author = {Xiaofeng Chen and Fangguo Zhang and  Haibo Tian and Kwangjo Kim},
    title = {Identity-Based Chameleon Hash Scheme Without Key Exposure},
    howpublished = {Cryptology ePrint Archive, Report 2009/400},
    year = {2009},
    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.