Cryptology ePrint Archive: BibTeX Citation of Report 2013/851

@misc{cryptoeprint:2013:851,
    author = {Ulrich Rührmair and Xiaolin Xu and Jan Sölter and Ahmed Mahmoud and Farinaz Koushanfar and Wayne Burleson},
    title = {Power and Timing Side Channels for PUFs and their Efficient Exploitation},
    howpublished = {Cryptology ePrint Archive, Report 2013/851},
    year = {2013},
    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.