Cryptology ePrint Archive: BibTeX Citation of Report 2013/682

@misc{cryptoeprint:2013:682,
    author = {Reza Hooshmand, Mohammad Reza Aref, and Taraneh Eghlidos},
    title = {Secret Key Cryptosystem based on  Non-Systematic Polar Codes},
    howpublished = {Cryptology ePrint Archive, Report 2013/682},
    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.