Cryptology ePrint Archive: BibTeX Citation of Report 2008/172

@misc{cryptoeprint:2008:172,
    author = {Arpita Patra and Ashish Choudhary and Tal Rabin and C. Pandu Rangan},
    title = {The Round Complexity of Verifiable Secret Sharing Revisited},
    howpublished = {Cryptology ePrint Archive, Report 2008/172},
    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.