Haven’t seen a new Oona post in a long time and this, as usual, was worth the wait.
I’d wager that the scrambling introduced in DisplayPort and later digital display protocols is more to do with emissions compliance than it is to prevent eavesdropping. Having dealt with HDMI in a compliance labs time or two, anything to get the radiated emissions to meet FCC Part 15 Class B is a huge boon.
I wonder if the scrambling can be defeated. If you know the scrambling pattern, presumably you could apply its inverse to the image being sent over the link.
I’d wager that the scrambling introduced in DisplayPort and later digital display protocols is more to do with emissions compliance than it is to prevent eavesdropping. Having dealt with HDMI in a compliance labs time or two, anything to get the radiated emissions to meet FCC Part 15 Class B is a huge boon.