@misc{cryptoeprint:2004:129,
author = {Joe Suzuki},
title = {Generalizing Kedlaya's order counting based on Miura Theory},
howpublished = {Cryptology ePrint Archive, Report 2004/129},
year = {2004},
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.