Cryptology ePrint Archive: BibTeX Citation of Report 2015/552

@misc{cryptoeprint:2015:552,
    author = {Paul Kirchner and Pierre-Alain Fouque},
    title = {An Improved BKW Algorithm for LWE with Applications to Cryptography and Lattices},
    howpublished = {Cryptology ePrint Archive, Report 2015/552},
    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.