Cryptology ePrint Archive: BibTeX Citation of Report 2009/302

@misc{cryptoeprint:2009:302,
    author = {Maria Naya-Plasencia and Andrea Röck and Jean-Philippe Aumasson and Yann Laigle-Chapuy and Gaëtan Leurent and Willi Meier and Thomas Peyrin},
    title = {Cryptanalysis of ESSENCE},
    howpublished = {Cryptology ePrint Archive, Report 2009/302},
    year = {2009},
    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.