Cyber-attacks 'bought us time' on Iran - U.S. sources
Barack Obama accelerated the efforts after succeeding Bush in 2009, according to the sources who spoke on condition of anonymity because of the classified nature of the effort. The weapon, called Stuxnet, was eventually used against Iran's main uranium enrichment facilities.
The effort was intended to bridge the time of uncertainty between U.S. administrations after the 2008 presidential election in which Obama was elected, and allow more time for sanctions and diplomacy to avert Iranian nuclear weapon development, according to the current and former officials.
The sources gave rare insight into the U.S. development of its cyber-warfare capabilities and the intent behind it.
One source familiar with the Bush administration's initial work on Stuxnet said it had stalled Iran's nuclear program by about five years.
"It bought us time. First, it was to get across from one administration to the next without having the issue blow up. And then it was to give Obama a little more time to come up with alternatives, through the sanctions, et cetera," said the source.
Only in recent months have U.S. officials become more open about the work of the United States and Israel on Stuxnet, the sophisticated cyber-weapon directed against Iran's Natanz nuclear enrichment facility that was first detected in 2010.
The cyber-attacks provided the United States with an avenue to try to stop Iran from producing a suspected weapon without turning to military strikes against Iranian facilities - all at a time when U.S. forces already were fighting wars in Iraq and Afghanistan, the sources said.
Two sources with direct knowledge of the U.S. program said it cost hundreds of millions of dollars to carry out.
The United States for years has been developing - and using - offensive cyber-capabilities to interfere with the computers of adversaries, including during the Battle of Falluja in Iraq in 2004 and in finding Osama bin Laden and other al Qaeda figures, the sources said.
Last year, the United States also explicitly stated for the first time that it reserved the right to retaliate with military force against a cyber-attack.
Reuters reported on May 29 that the United Nations agency charged with helping member nations secure their national infrastructures plans to issue a sharp warning about the risk of the Flame computer virus that was recently discovered in Iran and other parts of the Middle East.
Stuxnet is one of many weapons in the U.S. cyber-arsenal, which some experts say also includes a data-gathering tool known as Duqu that was deployed to cull information about Iran's weapons programs.
Iranian officials have described the cyber-attacks as part of a "terrorist" campaign backed by Israel and the United States.
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