Cryptology ePrint Archive: BibTeX Citation of Report 2006/353

@misc{cryptoeprint:2006:353,
    author = {Zhenjie Huang and Kefei Chen and Yumin Wang},
    title = {Analysis and Improvements of Two Identity-Based Perfect Concurrent Signature Schemes},
    howpublished = {Cryptology ePrint Archive, Report 2006/353},
    year = {2006},
    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.