Cryptology ePrint Archive: BibTeX Citation of Report 2008/211

@misc{cryptoeprint:2008:211,
    author = {Goichiro Hanaoka and Kaoru Kurosawa},
    title = {Efficient Chosen Ciphertext Secure Public Key Encryption under the Computational Diffie-Hellman Assumption},
    howpublished = {Cryptology ePrint Archive, Report 2008/211},
    year = {2008},
    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.