Cryptology ePrint Archive: BibTeX Citation of Report 2012/431

@misc{cryptoeprint:2012:431,
    author = {Yusuke Sakai and Jacob C.N. Schuldt and Keita Emura and Goichiro Hanaoka and Kazuo Ohta},
    title = {On the Security of Dynamic Group Signatures: Preventing Signature Hijacking},
    howpublished = {Cryptology ePrint Archive, Report 2012/431},
    year = {2012},
    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.