Cryptology ePrint Archive: BibTeX Citation of Report 2015/691

@misc{cryptoeprint:2015:691,
    author = {Cong Chen and Mehmet Sinan Inci and Mostafa Taha and Thomas Eisenbarth},
    title = {SpecTre: A Tiny Side-Channel Resistant Speck Core for FPGAs},
    howpublished = {Cryptology ePrint Archive, Report 2015/691},
    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.