@misc{cryptoeprint:2011:580,
author = {Abdoul Aziz Ciss and Djiby Sow},
title = {On a new generalization of Huff curves},
howpublished = {Cryptology ePrint Archive, Report 2011/580},
year = {2011},
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.