Cryptology ePrint Archive: BibTeX Citation of Report 2005/320

@misc{cryptoeprint:2005:320,
    author = {Nuttapong Attrapadung and Benoit Chevallier-Mames and Jun Furukawa and Takeshi Gomi and Goichiro Hanaoka and Hideki Imai and Rui Zhang},
    title = {Efficient Identity-Based Encryption with Tight Security Reduction},
    howpublished = {Cryptology ePrint Archive, Report 2005/320},
    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.