@misc{cryptoeprint:2008:402,
author = {Jean-Charles Faugère and Ludovic Perret},
title = {Algebraic Cryptanalysis of Curry and Flurry using Correlated Messages},
howpublished = {Cryptology ePrint Archive, Report 2008/402},
year = {2008},
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.