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Okay lets say that the ethernet MAC has some gates that detect a particular 1024-bit random bit pattern in packets and that triggers a behavior change in certain sequence of instructions common in Windows security code to bypass it. How would you discover this?

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https://isc.sans.edu/forums/diary/Intel+Network+Card+82574L+...

What do you mean the ethernet card triggers changes in Windows instructions? Do you mean it can scan the RAM and do some changes? I am not familiar with how recent hardware works but I would be worried if hardware could scan RAM and edit executable code bypassing the kernel and drivers, so more reasons to get open hardware and drivers.

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