@misc{cryptoeprint:2012:112,
author = {Meltem Sonmez Turan},
title = {On The Nonlinearity of Maximum-length NFSR Feedbacks},
howpublished = {Cryptology ePrint Archive, Report 2012/112},
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.