Be invited by the USA to join the Stone Age.
“Cyberattacks can amount to armed attacks triggering the right of self-defense and are subject to international laws of war, the State Department’s top lawyer said Tuesday.
http://www.guardian.co.uk/commentisfree/2012/sep/19/cyberwar-last-gasps-hate-speech
Edit: Jimmy Did you notice this paragraph.
“Of course, Koh’s argument would only constitute a defense of Iran’s right to attack the US if the rights claimed by the US applied to other countries, so there’s nothing to worry about.”