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If the source code/hardware diagrams are kept private you should assume backdoors, always, with everything. How is there any other way to know for sure otherwise?

These government agencies are obviously dug much deeper in private industry than many expected so I wouldn't put it past them

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If you see the diagram, and someone else makes the chip, how do you know the diagram matches exactly with what's on the chip? Unless you can make your own chip from the diagram, you still cannot be sure.

Very valid point, and I you're right you really would have no idea. You could check on some devices if you knew enough about hardware to compare the internals and the diagram, but that is a select few people.

This is why customer-company relationships and company integrity is becoming increasingly important, and frankly not many US companies are doing well in that regard.

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