Cryptology ePrint Archive: BibTeX Citation of Report 2015/393

@misc{cryptoeprint:2015:393,
    author = {Mohammad Hossein Faghihi Sereshgi, Mohammad Dakhilalian, and Mohsen Shakiba},
    title = {Biclique cryptanalysis of MIBS-80 and PRESENT-80},
    howpublished = {Cryptology ePrint Archive, Report 2015/393},
    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.