@misc{cryptoeprint:2014:402,
author = {Nir Bitansky and Ran Canetti and Omer Paneth and Alon Rosen},
title = {On the Existence of Extractable One-Way Functions},
howpublished = {Cryptology ePrint Archive, Report 2014/402},
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.