> It's interesting you're using "biometric" as a qualifier implying something > "good". I wouldn't agree.
I mean in the sense that it's a lot easier for someone doing MITM to transparently rewrite the signatures in an email than it is to transparently detect that you are reading the verification code and then replace it with a synthesised version without breaking the flow of speech. It's not perfect, but it's a barrier at least. Thanks, Lachlan
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