"A cyber attack on Iranian missile systems, claimed by the US last week, would have had to exploit a flaw in the heavily-guarded network, experts say.
Citing US official sources, American media last week reported that the Army Cyber Command had crippled the Iranian Revolutionary Guard's air defence units that shot down a sophisticated drone on June 20.
Military computing security is usually "hardened" to defend against attack but highly-skilled computer scientists in cyber units of modern armies are always working to find a way in.
"The simplest way would be for a special forces member to plug in a USB (carrying a virus) to the right place," Loic Guezo of the French Information Security Club told AFP.
This is almost certainly how the well-known US-Israeli Stexnet virus was introduced in 2010, into the computers of Iran's nuclear complex, according to experts.
Iran at the time accused the US and Israel of using the virus to target its centrifuges used for uranium enrichment."
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