Cryptology ePrint Archive: BibTeX Citation of Report 1999/018

@misc{cryptoeprint:1999:018,
    author = {Mihir Bellare and Amit Sahai },
    title = {Non-Malleable Encryption: Equivalence between Two Notions, and an Indistinguishability-Based Characterization },
    howpublished = {Cryptology ePrint Archive, Report 1999/018},
    year = {1999},
    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.