Cryptology ePrint Archive: BibTeX Citation of Report 2012/326

@misc{cryptoeprint:2012:326,
    author = {Allison Lewko and Brent Waters},
    title = {New Proof Methods for Attribute-Based Encryption: Achieving Full Security through Selective Techniques},
    howpublished = {Cryptology ePrint Archive, Report 2012/326},
    year = {2012},
    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.