@misc{cryptoeprint:2007:347,
author = {Aaram Yun and Je Hong Park and Jooyoung Lee},
title = {Lai-Massey Scheme and Quasi-Feistel Networks},
howpublished = {Cryptology ePrint Archive, Report 2007/347},
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.