@misc{cryptoeprint:2015:193,
author = {Karim Bigou and Arnaud Tisserand},
title = {Improving Modular Inversion in RNS using the Plus-Minus Method},
howpublished = {Cryptology ePrint Archive, Report 2015/193},
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.