Cryptology ePrint Archive: BibTeX Citation of Report 2012/448

@misc{cryptoeprint:2012:448,
    author = {Goichiro Hanaoka and Takahiro Matsuda and Jacob C.N. Schuldt},
    title = {On the Impossibility of Constructing Efficient Key Encapsulation and Programmable Hash Functions in Prime Order Groups},
    howpublished = {Cryptology ePrint Archive, Report 2012/448},
    year = {2012},
    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.