@misc{cryptoeprint:2007:435,
author = {Daniel R. L. Brown},
title = {Irreducibility to the One-More Evaluation Problems: More May Be Less},
howpublished = {Cryptology ePrint Archive, Report 2007/435},
year = {2007},
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.