SMBlog -- 27 September 2010: "There are still many questions that haven't been answered, at least publicly, about Stuxnet. There are some that I suspect will never be answered in the open literature. But as I said in the first paragraph, I think we now have an existence proof for weapons-grade attack software. Policy-makers around the world need to take this into account; claiming it can't happen is no longer tenable. The real question is the cost of this sort of attack. Remember, though, that a single F-35 fighter plane is estimated to cost $112M 2010 dollars; that's not exactly cheap, either."