@misc{cryptoeprint:2004:061,
author = {Bo-Yin Yang and Jiun-Ming Chen},
title = {TTS: Rank Attacks in Tame-Like Multivariate PKCs},
howpublished = {Cryptology ePrint Archive, Report 2004/061},
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.