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The White House wants to 'cryptographically verify' videos of Joe Biden so viewers don't mistake them for AI deepfakes
(www.businessinsider.com)
This is a most excellent place for technology news and articles.
Well, there's your problem.
The most commonly-used mail client in the world is the Gmail web client which does not support it. Uploading your PGP key to Gmail and having them store it server-side for use in a webmail client is obviously problematic from a security standpoint. Number 2 I would guess is Outlook, which appears also not to support it. For most people, I don't think they understand the value of cryptographically signing emails and going through the hassle of generating and publishing their PGP keys, especially since Windows has no built-in easy application for generating and managing such keys.
There's also the case that for most people, signing their emails provides absolutely no immediate benefit to them.
Plus that's email. What about... Literally everything else?
Yeah, almost nothing has good PGP integration.
Except Git, apparently.