Cryptology ePrint Archive: BibTeX Citation of Report 2005/339

@misc{cryptoeprint:2005:339,
    author = {Zhaohui Cheng and Liqun Chen and Richard Comley and Qiang Tang},
    title = {Identity-Based Key Agreement with Unilateral Identity Privacy Using Pairings},
    howpublished = {Cryptology ePrint Archive, Report 2005/339},
    year = {2005},
    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.