William Maclean reporting for Reuters discusses the mounting evidence that the Stuxnet worm was aimed at particular converter drive frequencies which have limited applications – including control of gas centrifuges. An excerpt:
“This finding strongly points to a controller for a module in a gas centrifuge cascade,” [Leading German cyber expert Ralph Langner] blogged. “One reasonable goal for the attack could be to destroy the centrifuge rotor by vibration, which causes the centrifuge to explode.