Cryptology ePrint Archive: BibTeX Citation of Report 2015/180

@misc{cryptoeprint:2015:180,
    author = {Abhishek Banerjee and Georg Fuchsbauer and Chris Peikert and Krzysztof Pietrzak and Sophie Stevens},
    title = {Key-Homomorphic Constrained Pseudorandom Functions},
    howpublished = {Cryptology ePrint Archive, Report 2015/180},
    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.