@misc{cryptoeprint:2011:281,
author = {Michael Backes and Aniket Kate and Arpita Patra },
title = {Computational Verifiable Secret Sharing Revisited},
howpublished = {Cryptology ePrint Archive, Report 2011/281},
year = {2011},
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.