Cryptology ePrint Archive: BibTeX Citation of Report 1998/021

@misc{cryptoeprint:1998:021,
    author = {Mihir Bellare,Anand Desai, David Pointcheval and Phillip Rogaway},
    title = {Relations among Notions of Security for Public-Key Encryption Schemes},
    howpublished = {Cryptology ePrint Archive, Report 1998/021},
    year = {1998},
    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.