@misc{cryptoeprint:2005:362,
author = {Michael Scott and Paulo S. L. M. Barreto},
title = {On a (Flawed) Proposal to Build More Pairing-Friendly Curves},
howpublished = {Cryptology ePrint Archive, Report 2005/362},
year = {2005},
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.