The US has literally accused China of stealing the plans for the F-35. Recently, a US army soldier was arrested for spying for the Chinese.
Yeah, I figure you might give this example. Except nothing of actual relevance related to tech formula was stolen. It was related to aircraft design and system performance perimeters. Chinese hakcers access it through company networks. Except even then the most secretive and high end technologies being developed for F35 were kept isolated from broader network to exactly avoid this type of breaches.
There are levels to how classified something is. Even then after that incident procedures were tighten further to avoid future breaches in lower ends.
Again, one is partial knowledge about how something would perform. Which you probably could guesstimate anyway with your own experts. (Specially when you have you own extensive R&D in the same field.) Getting hand on those data would only confirm that.
(You can acess the data on Eurofighter trench 1 performance perimeters in detail from warthundner leaks. I have the PDF myself that is classified and originally meant for RAF personel and pilots who would fly the jet.)
Another thing is the tech formula developed to build the systems themselves. Those are guarded far better. And always kept off the network. And then they are being developed by multiple entities none of them has full access to what formula others are using to design and Develop their assigned systems .
Plus, today all hardware is only as relevant as its software, whether it is radar or EW, fusion engine or flight control system. And those are always being developed and updated frequently. And no one has access to that.
Yeah, they probably do.
You think they don't? Because you'd be naive to believe so.
Or respectfully you probably don't have accurate idea about this.
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