@misc{cryptoeprint:2007:429,
author = {Michael Naehrig and Paulo S. L. M. Barreto and Peter Schwabe},
title = {On compressible pairings and their computation},
howpublished = {Cryptology ePrint Archive, Report 2007/429},
year = {2007},
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.