Cryptology ePrint Archive: BibTeX Citation of Report 2014/300

@misc{cryptoeprint:2014:300,
    author = {Robert Granger and Thorsten Kleinjung and Jens Zumbr\"agel},
    title = {On the Powers of 2},
    howpublished = {Cryptology ePrint Archive, Report 2014/300},
    year = {2014},
    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.