@misc{cryptoeprint:2014:536,
author = {Tian Tian and Wen-Feng Qi},
title = {On Decomposition of an NFSR into a Cascade Connection of Two Smaller},
howpublished = {Cryptology ePrint Archive, Report 2014/536},
year = {2014},
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.