Cryptology ePrint Archive: BibTeX Citation of Report 2014/399

@misc{cryptoeprint:2014:399,
    author = {Dustin Moody and Ray Perlner and Daniel Smith-Tone},
    title = {An Asymptotically Optimal Structural Attack on the ABC Multivariate Encryption Scheme},
    howpublished = {Cryptology ePrint Archive, Report 2014/399},
    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.