Cryptology ePrint Archive: BibTeX Citation of Report 2015/312

@misc{cryptoeprint:2015:312,
    author = {Pierre-Alain Fouque and Thomas Vannet},
    title = {Improving Key Recovery to 784 and 799 rounds of Trivium using Optimized Cube Attacks},
    howpublished = {Cryptology ePrint Archive, Report 2015/312},
    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.