Cryptology ePrint Archive: BibTeX Citation of Report 2001/069

@misc{cryptoeprint:2001:069,
    author = {Boaz Barak and Oded Goldreich and Russell Impagliazzo and Steven Rudich and Amit Sahai and Salil Vadhan and Ke Yang},
    title = {On the (Im)possibility of Obfuscating Programs},
    howpublished = {Cryptology ePrint Archive, Report 2001/069},
    year = {2001},
    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.