Cryptology ePrint Archive: BibTeX Citation of Report 2010/375

@misc{cryptoeprint:2010:375,
    author = {Kota Ideguchi and Elmar Tischhauser and Bart Preneel},
    title = {Improved Collision Attacks on the Reduced-Round Gr{\o}stl Hash Function},
    howpublished = {Cryptology ePrint Archive, Report 2010/375},
    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.