Cryptology ePrint Archive: BibTeX Citation of Report 2012/240

@misc{cryptoeprint:2012:240,
    author = {Craig Gentry and Shai Halevi and Chris Peikert and Nigel P. Smart},
    title = {Field Switching in BGV-Style Homomorphic Encryption},
    howpublished = {Cryptology ePrint Archive, Report 2012/240},
    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.