@misc{cryptoeprint:2015:890,
author = {Wenbin Zhang and Chik How Tan},
title = {MI-T-HFE, a New Multivariate Signature Scheme},
howpublished = {Cryptology ePrint Archive, Report 2015/890},
year = {2015},
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.