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On 11/02/2024 14:52, The Natural Philosopher wrote:
> I think that its pretty difficult to encode an invisible backdoor in the
> silicon and not have it spotted at some fairly early stage.
Then don't hide it, have it there in plain sight - like the Intel
Management Engine, and the AMD equivalent.
> So many of these 'threat narratives' are, when examined closely,
> implausible to the point of downright impossibility.
The more you examine details of the IME that we know about, the more
worrying it gets. It's a CPU within CPU running closed software with
higher privilege than main CPU, able to access all memory, any hardware
and create its own network connections.
> You can examine the machine code that your compiler and linker
> assembles. And people do. I certainly have done. If it doesn't match
> what you asked for in the high level language, there are questions to be
> answered.
You can look at the assembler of the main CPU as much as you like, but
you've no idea what is running on the IME.
Luckily ARM doesn't have a management engine - yet!
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