@misc{cryptoeprint:2003:056,
author = {Huafei Zhu and Bao Feng and Robert H. Deng},
title = {Computing of Trust in Distributed Networks},
howpublished = {Cryptology ePrint Archive, Report 2003/056},
year = {2003},
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.