Cryptology ePrint Archive: BibTeX Citation of Report 2013/526

@misc{cryptoeprint:2013:526,
    author = {Farzaneh Abed and Eik List and Stefan Lucks and Jakob Wenzel},
    title = {Differential and Linear Cryptanalysis of Reduced-Round Simon},
    howpublished = {Cryptology ePrint Archive, Report 2013/526},
    year = {2013},
    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.