Cryptology ePrint Archive: BibTeX Citation of Report 2014/383

@misc{cryptoeprint:2014:383,
    author = {Younsung Choi, Dongho Won},
    title = {Cryptanalysis of and Improvement on Biometric-based User Authentication Scheme for C/S System},
    howpublished = {Cryptology ePrint Archive, Report 2014/383},
    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.