Cryptology ePrint Archive: BibTeX Citation of Report 2014/239

@misc{cryptoeprint:2014:239,
    author = {Florian Legendre and Gilles Dequen and Michaël Krajecki},
    title = {Logical Reasoning to Detect Weaknesses About SHA-1 and MD4/5},
    howpublished = {Cryptology ePrint Archive, Report 2014/239},
    year = {2014},
    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.