Polycule

End-to-end encrypted voice

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Your safety number: …

Everyone's number is different — it identifies their key, not the call. To check nobody is in the middle, read your number aloud somewhere other than here, and have your friends confirm it matches the one shown next to your name on their screen. Do it once per person.

This matters because the server is what hands out public keys, so it is the one party able to substitute its own and listen in. If a number doesn't match, stop talking.