Yeah, this is my understanding also. I don't understand how this is better than the publisher signing the content with their own key though, rather than relying on a special microphone.
I wish the article was more clear on what threat model they're trying to address.
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I think in this case the point would be to trust the source publishing the audio and not content.
I cam see a gpg like registry where news stations publish their public keys to verify that their audio / video snippets have not been tampered with.
Yeah, this is my understanding also. I don't understand how this is better than the publisher signing the content with their own key though, rather than relying on a special microphone.
I wish the article was more clear on what threat model they're trying to address.