Obama decided not only to reauthorize the digital sabotage program but to accelerate it. It was in this environment that he gave the green light for a new, more aggressive, version of Stuxnet to launch—the one that targeted the frequency converters at Natanz.
First attack on the valves was in progress as Bush and Obama began transition. Obama was quickly convinced to continue program and also authorized the next generation of stuxnet that targeted the frequency converters (and was more aggressive in its infection to reach its targets, and thus was more easily detected). It seemed clear that the valve attack was working but not well enough. Iran was slowed but not stalled.
