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Of course you don't verbally sign voice messages. That wouldn't make any sense at all unless you are a robot or something.
It was just a joke. But if you wanted to authenticate something (like an email, or voice I guess) in a PKI you would sign it using your certificate private key and the CA would tell the recipient if it's valid or not.
That's what the article is about though, voice messages can now be spoofed. It happened to one of my friend's parents
I was implying that you do the actual singing verbally. Like actually saying the bits, which would be pretty much impossible.
Of course you could sign voice messages. That would be like singing any other file.
Ohh