Cryptology ePrint Archive: BibTeX Citation of Report 2011/390

@misc{cryptoeprint:2011:390,
    author = {Amir Moradi and Alessandro Barenghi and Timo Kasper and Christof Paar},
    title = {On the Vulnerability of FPGA Bitstream Encryption against Power Analysis Attacks – Extracting Keys from Xilinx Virtex-II FPGAs},
    howpublished = {Cryptology ePrint Archive, Report 2011/390},
    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.