One way: Everyone has a code-word which they only share with humans, over "private" channels like direct voice calls. For example, I'm "pineapple", and you're "

One way: Everyone has a code-word which they only share with humans, over "private" channels like direct voice calls. For example, I'm "pineapple", and you're "orange", when we're connected on a call, we share our code-words in order to "authenticate" the call. Another way: have a passphrase with a group of people that you share with each other, that is hard to guess but memorable. "The sky was green this morning" for example, that everyone in your family knows is the "human passphrase". Another way: ask personal questions only the actual human being would know, like inside jokes or specific details about their life. Another way: verify through some out-of-band method (like text message) in order to confirm their identity. Another way: start everything with a video call where they have to pass their hand in front of their face before switching to audio only None of the methods are perfect, all come with pro and cons. But writing all of this made me feel really dystopian for some reason...