Cryptology ePrint Archive: BibTeX Citation of Report 2015/100

@misc{cryptoeprint:2015:100,
    author = {Christian Wittke and Zoya Dyka and Peter Langendoerfer},
    title = {Influence of Electrical Circuits of ECC Designs on Shape of Electromagnetic Traces measured on FPGA},
    howpublished = {Cryptology ePrint Archive, Report 2015/100},
    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.