@misc{cryptoeprint:2012:346,
author = {Oumar DIAO and Emmanuel FOUOTSA},
title = {Edwards model of elliptic curves defined over any fields},
howpublished = {Cryptology ePrint Archive, Report 2012/346},
year = {2012},
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.