Who is behind Stuxnet attack on Iran?

A powerful computer virus is attacking Iran's nuclear program, and evidence indicates a targeted cyber attack from a national intelligence agency.

The Stuxnet worm targets German-manufactured Siemens software systems found in automated industrial systems like those in Iran's Bushehr nuclear reactor. Since Stuxnet's discovery in June, information technology analysts have now had time to study the worm, determining that due to its advanced nature and ability to exploit security vulnerabilities and using stolen security certificates, the worm may have been created by a national intelligence agency.

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