Cryptology ePrint Archive: BibTeX Citation of Report 2015/424

@misc{cryptoeprint:2015:424,
    author = {Begül Bilgin and Andrey Bogdanov and Miroslav Knežević and Florian Mendel and Qingju Wang},
    title = {FIDES: Lightweight Authenticated Cipher with Side-Channel Resistance for Constrained Hardware},
    howpublished = {Cryptology ePrint Archive, Report 2015/424},
    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.