Most likely this. I vividly remember reading this the first time I had heard about STUXNET. https://www.quora.com/What-is-the-most-sophisticated-piece-of-softw

Most likely this. I vividly remember reading this the first time I had heard about STUXNET. https://www.quora.com/What-is-the-most-sophisticated-piece-of-software-ever-written-1/answer/John-Byrd-2 https://www.quora.com/What-is-the-most-sophisticated-piece-o... edit: someone beat me to it, I just didn't notice since it wasn't a direct link: https://news.ycombinator.com/item?id=38518286 https://news.ycombinator.com/item?id=38518286