Cryptology ePrint Archive: BibTeX Citation of Report 2013/685

@misc{cryptoeprint:2013:685,
    author = {Anja Becker, Nicolas Gama and Antoine Joux},
    title = {Solving shortest and closest vector problems: The decomposition approach},
    howpublished = {Cryptology ePrint Archive, Report 2013/685},
    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.