NY Times: Unnamed experts tell The New York Times that scientists tested the Stuxnet worm at the Israeli Dimona complex in the months before it devastated Iran's nuclear capabilities. They say the U.S. and Israel have installed machinery at the complex that is identical to that used by Iran's nuclear facilities. To check out the worm, you have to know the machines, said an American expert on nuclear intelligence. The reason the worm has been effective is that the Israelis tried it out.
The Stuxnet worm caused Iranian centrifuges to spin out of control while providing data to operators that showed the machines were working as usual. Experts say the worm delayed Iranian construction of nuclear weapons until 2015.