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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.
The problem is that even if you reveal the video as fake,the feeling it reinforces on the viewer stays with them.
"Sure that was fake,but the fake that it seems believable tells you everything you need to know"
"Herd immunity" comes into play here. If those people keep getting dismissed by most other people because the video isn't signed they'll give up and follow the crowd. Culture is incredibly powerful.