For much of the last decade, as Iran methodically built its nuclear program, Israel has been assembling a multibillion-dollar array of high-tech weapons that would allow it to jam, blind, and deafen Tehran's defenses in the case of a pre-emptive aerial strike.
A U.S. intelligence assessment this summer, described to The Daily Beast by current and former U.S. intelligence officials, concluded that any Israeli attack on hardened nuclear sites in Iran would go far beyond airstrikes from F-15 and F-16 fighter planes and likely include electronic warfare against Iran’s electric grid, Internet, cellphone network, and emergency frequencies for firemen and police officers.
For example, Israel has developed a weapon capable of mimicking a maintenance cellphone signal that commands a cell network to “sleep,” effectively stopping transmissions, officials confirmed. The Israelis also have jammers capable of creating interference within Iran’s emergency frequencies for first responders.
In a 2007 attack on a suspected nuclear site at al-Kibar, the Syrian military got a taste of this warfare when Israeli planes “spoofed” the country’s air-defense radars, at first making it appear that no jets were in the sky and then in an instant making the radar believe the sky was filled with hundreds of planes.
Israel also likely would exploit a vulnerability that U.S. officials detected two years ago in Iran's big-city electric grids, which are not “air-gapped”—meaning they are connected to the Internet and therefore vulnerable to a Stuxnet-style cyberattack—officials say.
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http://www.thedailybeast.com/articles/2011/11/16/israel-s-secret-iran-attack-plan-electronic-warfare.html