Cryptology ePrint Archive: BibTeX Citation of Report 2013/446

@misc{cryptoeprint:2013:446,
    author = {Gora Adj and Alfred Menezes and Thomaz Oliveira and Francisco Rodr\'iguez-Henr\'iquez},
    title = {Weakness of F_{3^{6*509}} for Discrete Logarithm Cryptography},
    howpublished = {Cryptology ePrint Archive, Report 2013/446},
    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.