Cryptology ePrint Archive: BibTeX Citation of Report 2007/030

@misc{cryptoeprint:2007:030,
    author = {Yang Cui and Eiichiro Fujisaki and Goichiro Hanaoka and Hideki Imai and Rui Zhang},
    title = {Formal Security Treatments for IBE-to-Signature Transformation: Relations among Security Notions},
    howpublished = {Cryptology ePrint Archive, Report 2007/030},
    year = {2007},
    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.