Cryptology ePrint Archive: BibTeX Citation of Report 2015/139

@misc{cryptoeprint:2015:139,
    author = {Donghoon Chang and Arpan Jati and Sweta Mishra and Somitra Kumar Sanadhya},
    title = {Performance Analysis of Some Password Hashing Schemes},
    howpublished = {Cryptology ePrint Archive, Report 2015/139},
    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.