Cryptology ePrint Archive: BibTeX Citation of Report 2015/143

@misc{cryptoeprint:2015:143,
    author = {Erich Wenger and Paul Wolfger},
    title = {Harder, Better, Faster, Stronger - Elliptic Curve Discrete Logarithm Computations on FPGAs},
    howpublished = {Cryptology ePrint Archive, Report 2015/143},
    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.