Cryptology ePrint Archive: BibTeX Citation of Report 2015/724

@misc{cryptoeprint:2015:724,
    author = {Oscar Reparaz and Sujoy Sinha Roy and Frederik Vercauteren and Ingrid Verbauwhede},
    title = {A masked ring-LWE implementation},
    howpublished = {Cryptology ePrint Archive, Report 2015/724},
    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.