I just read through the MS docs on SecureBoot and this is the biggest 
Rube-Goldberg machine.

I could not think of a nastier solution to a problem than what they've dreamt 
up here.


The whole problem they are trying to solve is that of booting only known-good 
code.


That would be much easier accomplished by having the OS reside on a read-only 
device that could only be written to by
the user actively using hardware to enable the write during installation.

That would create a system where there was no possible programmatic means of 
corrupting the OS during normal operation.

No signatures, no crypto-databases, or other SecureBoot gobbledy-gook needed.


To implement this would require only that new systems support two drives, one 
with controllable-by-user
read-write-controller interface for storing the OS. 

Forensic firms have been using these types of read-write controllable drive 
interfaces for years.  Hardware already exists.


.
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