@misc{cryptoeprint:2014:754,
author = {Lucas Kowalczyk and Allison Bishop Lewko},
title = {Bilinear Entropy Expansion from the Decisional Linear Assumption},
howpublished = {Cryptology ePrint Archive, Report 2014/754},
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.