Cryptology ePrint Archive: BibTeX Citation of Report 2013/093

@misc{cryptoeprint:2013:093,
    author = {Lin Cheng and Qiaoyan Wen and Zhengping Jin and Hua Zhang and Liming Zhou},
    title = {On the security of a certificateless aggregate signature scheme},
    howpublished = {Cryptology ePrint Archive, Report 2013/093},
    year = {2013},
    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.