Cryptology ePrint Archive: BibTeX Citation of Report 2009/512

@misc{cryptoeprint:2009:512,
    author = {Joel Alwen and Yevgeniy Dodis and Moni Naor and Gil Segev and Shabsi Walfish and Daniel Wichs},
    title = {Public-Key Encryption in the Bounded-Retrieval Model},
    howpublished = {Cryptology ePrint Archive, Report 2009/512},
    year = {2009},
    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.