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As you described it, this relay scheme is secure, if the data relayed via the server is properly authenticated and encrypted. The only attack vector I found would be, that an attacker could determine (based on the pairing codes) which 2 clients want to talk which each other, but traffic analysis would have shown this either way. As the API distributes keys ...


To the best of my knowledge this is secure, if you choose all primitives correctly. If I'd want to use such a system (and I have thought about it already), I'd go with a similar approach. However I'm suggesting you one change: Don't give your witnesses the payload. Give them the shares, so they can reconstruct the private key and let them then get to your ...

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