Cryptology ePrint Archive: BibTeX Citation of Report 2004/188

@misc{cryptoeprint:2004:188,
    author = {Vincent Carlier and Hervé Chabanne and Emmanuelle Dottax},
    title = {Grey Box Implementation of Block Ciphers Preserving the Confidentiality of their Design},
    howpublished = {Cryptology ePrint Archive, Report 2004/188},
    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.