@misc{cryptoeprint:2013:864,
author = {Adam Smith and Ye Zhang},
title = {Near-linear time, Leakage-resilient Key Evolution Schemes from Expander Graphs},
howpublished = {Cryptology ePrint Archive, Report 2013/864},
year = {2013},
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.