@misc{cryptoeprint:2007:191,
author = {Andrew C. C. Yao, Frances F. Yao, Yunlei Zhao, Bin Zhu},
title = {Deniable Internet Key-Exchange},
howpublished = {Cryptology ePrint Archive, Report 2007/191},
year = {2007},
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.