Cryptology ePrint Archive: BibTeX Citation of Report 2004/338

@misc{cryptoeprint:2004:338,
    author = {Yumiko Hanaoka and Goichiro Hanaoka and Junji Shikata and Hideki Imai},
    title = {Identity-Based Hierarchical Strongly Key-Insulated Encryption and Its Application},
    howpublished = {Cryptology ePrint Archive, Report 2004/338},
    year = {2004},
    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.