Cryptology ePrint Archive: BibTeX Citation of Report 2014/220

@misc{cryptoeprint:2014:220,
    author = {Shahram Rasoolzadeh and Zahra Ahmadian and Mahmoud Salmasizadeh and Mohammad Reza Aref},
    title = {Total Break of Zorro using Linear and Differential Attacks},
    howpublished = {Cryptology ePrint Archive, Report 2014/220},
    year = {2014},
    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.