THE STUXNET In June 2010 the nuclear facilities in Iran were taken down by a suspicious computer code completely change the face of global warfare. Stuxnet was a small computer code of size nearly 500 KB specially designed to target the industrial control system that are use to monitor and control the large scale facilities such as - power plant, dams, waste processing system etc. Stuxnet doesn't need any Internet connection to spread it can be via USB drives, target of Stuxnet was Microsoft Windows based operating systems deployed by Siemens .Such system are high speed centrifuges that help to enrich the nuclear fuel .Stuxnet was different from other worms as it was not even identified by security experts ,as it shows a certificate that it belong to a certified source and not to be consider a miscellaneous software . After getting to the target it first verify it ,if the