Cryptology ePrint Archive: BibTeX Citation of Report 2015/854

@misc{cryptoeprint:2015:854,
    author = {Jeroen Delvaux and Dawu Gu and Ingrid Verbauwhede and Matthias Hiller and Meng-Day (Mandel) Yu},
    title = {Secure Sketch Metamorphosis: Tight Unified Bounds},
    howpublished = {Cryptology ePrint Archive, Report 2015/854},
    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.