> Why not write the keyboard driver the same way how the friend did it
> in his OS - using bitmasking and avoiding conditional jumps and
> lookup tables? Then the security would be guaranteed and not just
> hoped for.

Why not write the driver yourself?

I don't see the reason to jump and reinvent wheels (that are rather
complicated) every time some alarmist invents yet another improbable
threat.

//art

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