Cryptology ePrint Archive: BibTeX Citation of Report 2015/315

@misc{cryptoeprint:2015:315,
    author = {Grégory Demay and Peter Gaži and Ueli Maurer and Björn Tackmann},
    title = {Query-Complexity Amplification for Random  Oracles},
    howpublished = {Cryptology ePrint Archive, Report 2015/315},
    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.