@misc{cryptoeprint:2011:130,
author = {Dongdai Lin, Tao Shi, and Zifeng Yang},
title = {Ergodic Theory Over ${\F}_2[[T]]$},
howpublished = {Cryptology ePrint Archive, Report 2011/130},
year = {2011},
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.