Cryptology ePrint Archive: BibTeX Citation of Report 2013/600

@misc{cryptoeprint:2013:600,
    author = {Florian Mendel and Thomas Peyrin and Martin Schläffer and Lei Wang and Shuang Wu},
    title = {Improved Cryptanalysis of Reduced RIPEMD-160},
    howpublished = {Cryptology ePrint Archive, Report 2013/600},
    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.