@misc{cryptoeprint:2012:008,
author = {Hubert Comon-Lundh and Véronique Cortier and Guillaume Scerri},
title = {Security proof with dishonest keys},
howpublished = {Cryptology ePrint Archive, Report 2012/008},
year = {2012},
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.