That last scenario you describe would be pretty damn intense! I imagine the amount of info that passed between them in 5 minutes, could make up for all the info that has been Googled in the last 10 years!
I think on a personal note, as we get to the point where we are spending more time in virtualities, then personal identification is getting more important. I touched upon it in my sci-fi serries; Asimov's Ghost.
I think it will come down to some kind of nano-identifier, a kind of immutable DNA/Tech based blockchain. That way we can identify ourselves anonymously as well.
One thing is for sure. The future is going to be so different than what it is today that we might not even recognise it. Technology is going to really turn every stone imaginable.
Yup,
I think the doo-doo will really hit the fan when that first quantum computer cracks every password on earth in under a minute!
Cg
It is scary even imagining that!! Add to that the fact that quantum computers are going to become a reality very soon!!