Cryptology ePrint Archive: BibTeX Citation of Report 2013/866

@misc{cryptoeprint:2013:866,
    author = {Sujoy Sinha Roy and Frederik Vercauteren and Nele Mentens and Donald Donglong Chen and Ingrid Verbauwhede},
    title = {Compact Ring-LWE based Cryptoprocessor},
    howpublished = {Cryptology ePrint Archive, Report 2013/866},
    year = {2013},
    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.