@misc{cryptoeprint:2010:561,
author = {Stanislaw Jarecki and Ali Bagherzandi and Nitesh Saxena and Yanbin Lu},
title = {Password-Protected Secret Sharing},
howpublished = {Cryptology ePrint Archive, Report 2010/561},
year = {2010},
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.