@misc{cryptoeprint:2010:660,
author = {Brian J. Matt},
title = {Identification of Multiple Invalid Pairing-based Signatures in Constrained Batches},
howpublished = {Cryptology ePrint Archive, Report 2010/660},
year = {2010},
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.