@misc{cryptoeprint:2011:519,
author = {Stefan Dziembowski and Sebastian Faust},
title = {Leakage-Resilient Cryptography From the Inner-Product Extractor},
howpublished = {Cryptology ePrint Archive, Report 2011/519},
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.