Cryptology ePrint Archive: BibTeX Citation of Report 2011/534

@misc{cryptoeprint:2011:534,
    author = {Maxime Nassar and Sylvain Guilley and Jean-Luc Danger},
    title = {Formal Analysis of the Entropy / Security Trade-off in First-Order Masking Countermeasures against Side-Channel Attacks},
    howpublished = {Cryptology ePrint Archive, Report 2011/534},
    year = {2011},
    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.