Note that B1 security doesn't even begin to address many significant
network security issues.
> You don't gain root. (if you did, who cares anymore?) This is about
> normal users writing fake logins that might get root's password.
If someone gains root (or even runs a non-framebuffer X server), that
violates any sort of "Trusted Path" assumption that would be inherent
in SAK.
However, there already is an SAK implemented on every pc in existence:
the power switch.
http://cuiwww.unige.ch/info/pc/remote-boot/
[This does make some assumptions about the sort of circumstance where
you'd have multiple users and need a secure attention key. But those
assumption seem right for most cases I can imagine.]
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