@misc{cryptoeprint:2006:406,
author = {Yuto Nakano and Hidenori Kuwakado and Masakatu Morii},
title = {Redundancy of the Wang-Yu Sufficient Conditions},
howpublished = {Cryptology ePrint Archive, Report 2006/406},
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.