Cryptology ePrint Archive: BibTeX Citation of Report 2015/483

@misc{cryptoeprint:2015:483,
    author = {Shi Bai and Adeline Langlois and Tancr{\`e}de Lepoint and Damien Stehl\'e and Ron Steinfeld},
    title = {Improved security proofs in lattice-based cryptography: using the R\'enyi divergence rather than the statistical distance},
    howpublished = {Cryptology ePrint Archive, Report 2015/483},
    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.