Re: Seems like Rube Goldberg approach to spying
That doesn't work. If anything modifies those chips later (I.E. the manufacturer updates something), your bug is destroyed. If the chip is tested, you are discovered. And you can't easily make new holes in the thing because you didn't design it. With a separate chip, the manufacturer updating a chip can't kill you, a test of a component cannot find you out, and you can use all those existing chips to hide yours, which can be really tiny and be set under another chip.