@misc{cryptoeprint:2012:436,
author = {Melissa Chase and Ivan Visconti},
title = {Secure Database Commitments and Universal Arguments of Quasi Knowledge},
howpublished = {Cryptology ePrint Archive, Report 2012/436},
year = {2012},
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.