@misc{cryptoeprint:2011:412,
author = {Andrew Moss and Elisabeth Oswald and Dan Page and Michael Tunstall},
title = {Automatic Insertion of DPA Countermeasures},
howpublished = {Cryptology ePrint Archive, Report 2011/412},
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.