Cryptology ePrint Archive: BibTeX Citation of Report 2015/911

@misc{cryptoeprint:2015:911,
    author = {Kai Zhang and Jie Guan and Bin Hu and Dongdai Lin},
    title = {Security Evaluation on Simeck against Zero Correlation Linear Cryptanalysis},
    howpublished = {Cryptology ePrint Archive, Report 2015/911},
    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.