Cryptology ePrint Archive: BibTeX Citation of Report 2010/252

@misc{cryptoeprint:2010:252,
    author = {Zhengping Jin and Qiaoyan Wen and Hua Zhang},
    title = {A supplement to Liu et al.'s certificateless signcryption scheme in the standard model},
    howpublished = {Cryptology ePrint Archive, Report 2010/252},
    year = {2010},
    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.