@misc{cryptoeprint:2012:719,
author = {Yun Song , Zhihui Li},
title = {An ideal multi-secret sharing scheme based on minimal privileged coalitions },
howpublished = {Cryptology ePrint Archive, Report 2012/719},
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.