@misc{cryptoeprint:2000:053,
author = {Thomas Johansson and Enes Pasalic},
title = {A Construction of Resilient Functions with High Nonlinearity},
howpublished = {Cryptology ePrint Archive, Report 2000/053},
year = {2000},
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.