Cryptology ePrint Archive: BibTeX Citation of Report 2008/429

@misc{cryptoeprint:2008:429,
    author = {Nishanth Chandran and Rafail Ostrovsky and William E. Skeith III},
    title = {Public-Key Encryption with Efficient Amortized Updates},
    howpublished = {Cryptology ePrint Archive, Report 2008/429},
    year = {2008},
    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.