@misc{cryptoeprint:2006:384,
author = {Shenghui Su, Yixian Yang, Bo Yang, and Shaolan Zhang},
title = {Design and Analysis of a Hash Ring-iterative Structure},
howpublished = {Cryptology ePrint Archive, Report 2006/384},
year = {2006},
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.