This has been revealed in a documentary film "Zero Days" to be out soon, reported the New York Times. "Zero Days" to be shown on Wednesday at the Berlin Film Festival.
The plan of cyber-attack which was coded as Nitro Zeus was planned to criple air defenses, communications systems and crucial parts of Iran's power grid.
Thousands of American military and intelligence personnel were involved in the planning of ‘Nitro Zeus'. It was part of an effort to assure President Obama that he had alternatives, short of a full-scale war, if Iran lashed out at the United States or its allies in the region.
Read More: Iran nuclear deal: Loses and gains for India
Iran and P5+ 1 nations reached the deal in April last year to curb Iran's nuclear programme and end most economic sanctions imposed on country. China, France, Russia, the United Kingdom, and the United States, plus Germany are called P5+1.