@misc{cryptoeprint:2012:545,
author = {Haibo Yi, Shaohua Tang, Lingling Xu},
title = {A Versatile Multi-Input Multiplier over Finite Fields},
howpublished = {Cryptology ePrint Archive, Report 2012/545},
year = {2012},
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.