Cryptology ePrint Archive: BibTeX Citation of Report 2004/074

@misc{cryptoeprint:2004:074,
    author = {Liam Keliher and Henk Meijer and Stafford Tavares},
    title = {Completion of Computation of Improved Upper Bound on the Maximum Average Linear Hull Probabilty for Rijndael},
    howpublished = {Cryptology ePrint Archive, Report 2004/074},
    year = {2004},
    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.