Cryptology ePrint Archive: BibTeX Citation of Report 2013/158

@misc{cryptoeprint:2013:158,
    author = {Armando Faz-Hernandez and Patrick Longa and Ana H. Sanchez},
    title = {Efficient and Secure Algorithms for GLV-Based Scalar Multiplication and their Implementation on GLV-GLS Curves (Extended Version)},
    howpublished = {Cryptology ePrint Archive, Report 2013/158},
    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.