@misc{cryptoeprint:2010:590,
author = {Andrey Bogdanov and Ilya Kizhvatov},
title = {Beyond the Limits of DPA: Combined Side-Channel Collision Attacks},
howpublished = {Cryptology ePrint Archive, Report 2010/590},
year = {2010},
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.