There will probably be a move towards signing everything digitally, so that you can know that the sender is authentic.
Loss and replacement of cryptographic tokens is an everyday occurence, and it is PITA to resolve.
Imagine trying to ascertain in 2100 if a particular will signed by a 20-y.o. using a 2022 digital signature is valid or forged.
We don't even know what is going to happen to the reliability of the algorithms themselves, much less cert issuers, revocation lists etc. Companies come and go. Certain files from the 1990s are already unreadable.
If you consider your impression from the video stream to be the "password" then there must be a second factor to confirm it. Signed audio/video streams is probably where we're headed. Devices used for real time communication will just require a TPM (many already have them).
> How do I know it's my children facetiming me in the nursing home and not just sending their bots to entertain me?
That means that in order to call you their device will have to prove it's the actual stream from the actual camera module on their uniquely identified phone. Every component of a computer system will have cryptographic elements soon enough. There's no way around this if AI ever gets to that level.
If you’re in a position where you don’t trust them to not dupe you on a human level, you already lose. No technology in the world can help you
This is the worst solution. We’re going towards more personal verification. If I’ve met you and dealt with you, I’ll accept your digital signature. Otherwise, I need someone (or a brand) in between to vouch.