@misc{cryptoeprint:2006:140,
author = {Jiejun Kong},
title = {GVG-RP: A Net-centric Negligibility-based Security Model for Self-organizing Networks},
howpublished = {Cryptology ePrint Archive, Report 2006/140},
year = {2006},
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.