Cryptology ePrint Archive: BibTeX Citation of Report 2015/201

@misc{cryptoeprint:2015:201,
    author = {A. Mahmoodi Rishakani and S. M. Dehnavi and M. R. Mirzaee Shamsabad and Hamidreza Maimani and Einollah Pasha},
    title = {Statistical Properties of Multiplication mod $2^n$},
    howpublished = {Cryptology ePrint Archive, Report 2015/201},
    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.