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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 ...


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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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