@misc{cryptoeprint:2009:419,
author = {Jean-Sébastien Coron and Ilya Kizhvatov},
title = {An Efficient Method for Random Delay Generation in Embedded Software},
howpublished = {Cryptology ePrint Archive, Report 2009/419},
year = {2009},
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.