Cryptology ePrint Archive: BibTeX Citation of Report 2015/421

@misc{cryptoeprint:2015:421,
    author = {Zhe Liu and Husen Wang and Johann Gro{\ss}sch{\"a}dl and Zhi Hu and Ingrid Verbauwhede},
    title = {VLSI Implementation of Double-Base Scalar Multiplication on a Twisted Edwards Curve with an Efficiently Computable Endomorphism},
    howpublished = {Cryptology ePrint Archive, Report 2015/421},
    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.