Cryptology ePrint Archive: BibTeX Citation of Report 2015/374

@misc{cryptoeprint:2015:374,
    author = {Christoph Bader and Tibor Jager and Yong Li and Sven Schäge},
    title = {On the Impossibility of Tight Cryptographic Reductions},
    howpublished = {Cryptology ePrint Archive, Report 2015/374},
    year = {2015},
    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.