Cryptology ePrint Archive: BibTeX Citation of Report 2010/043

@misc{cryptoeprint:2010:043,
    author = {Jean-Philippe Aumasson and Jian Guo and Simon Knellwolf and Krystian Matusiewicz and Willi Meier},
    title = {Differential and invertibility properties of BLAKE (full version)},
    howpublished = {Cryptology ePrint Archive, Report 2010/043},
    year = {2010},
    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.