@misc{cryptoeprint:2013:055,
author = {Dima Grigoriev and Vladimir Shpilrain},
title = {Secrecy without one-way functions},
howpublished = {Cryptology ePrint Archive, Report 2013/055},
year = {2013},
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.