@misc{cryptoeprint:2005:358,
author = {Haining Fan and Duo Liu and Yiqi Dai},
title = {Normal Basis Multiplication Algorithms for GF(2n) (Full Version)},
howpublished = {Cryptology ePrint Archive, Report 2005/358},
year = {2005},
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.