> Certificates signed by TrustCor that were issued before December 1st will still be trusted (for now); certificates issued on December 1st or later will not be.
How does this work? If TrustCor is no longer trusted, what keeps them from creating certificates which claim to be issued before December 1st, even after that date?
Just a guess: In priciple, yes, but it wouldn't be very practial. Because of noise sources on earth, one would need very big antennas pointing to the pulsars to get good s/n ratios.
Additionally, as x-rays are blocked by the atmosphere, one would be limited to longer-wavelength pulsars, again increasing the size of the antennas.
Given that, using GPS, we already have a positioning system much more accurate, I don't see why one would use pulsars for positioning on earth.
How does this work? If TrustCor is no longer trusted, what keeps them from creating certificates which claim to be issued before December 1st, even after that date?