Just a few years back, Vernor Vinge's scifi novels still seemed reasonably futuristic in dealing with the issue of fakes well by including several bits where the resolution of imagery was a factor in being able to analyze with sufficient certainty that you were talking to the right person, and now that notion already seems dated, and certainly not enough for a setting far into the future.

(at least they don't still seem as dated as Johnny Mnemonic's plot of erasing a chunk of your memories to transport an amount of data that would be easier and less painful to fit in your head by stuffing a microsd card up your nose)