Cryptology ePrint Archive: BibTeX Citation of Report 2015/758

@misc{cryptoeprint:2015:758,
    author = {Yara Elias and Kristin E. Lauter and Ekin Ozman and Katherine E. Stange},
    title = {Ring-LWE Cryptography for the Number Theorist},
    howpublished = {Cryptology ePrint Archive, Report 2015/758},
    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.