Cryptology ePrint Archive: BibTeX Citation of Report 2003/172

@misc{cryptoeprint:2003:172,
    author = {Nick Howgrave-Graham and Joseph H. Silverman and Ari Singer and William Whyte},
    title = {NAEP: Provable Security in the Presence of Decryption Failures},
    howpublished = {Cryptology ePrint Archive, Report 2003/172},
    year = {2003},
    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.