Cryptology ePrint Archive: BibTeX Citation of Report 2012/348

@misc{cryptoeprint:2012:348,
    author = {Jan Camenisch and Maria Dubovitskaya and Robert R. Enderlein and Gregory Neven},
    title = {Oblivious Transfer with Hidden Access Control from Attribute-Based Encryption},
    howpublished = {Cryptology ePrint Archive, Report 2012/348},
    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.