Quantum Resistance and the Signal Protocol
Why not use something like backchannel?  That way we wouldn&#x27;t need phone numbers either...<p>The initial shared private key exchange could be done with more expensive, quantum resistant cryptography but the actual communication could be done through symmetric encryption.<p><a href="https:&#x2F;&#x2F;www.inkandswitch.com&#x2F;backchannel&#x2F;" rel="nofollow noreferrer">https:&#x2F;&#x2F;www.inkandswitch.com&#x2F;backchannel&#x2F;</a><p>For the key exchange itself (&quot;PAKE&quot;) maybe something like this: <a href="https:&#x2F;&#x2F;journal-home.s3.ap-northeast-2.amazonaws.com&#x2F;site&#x2F;icisc2021&#x2F;presentation&#x2F;paper_42.pdf" rel="nofollow noreferrer">https:&#x2F;&#x2F;journal-home.s3.ap-northeast-2.amazonaws.com&#x2F;site&#x2F;ic...</a><p>And for the symmetric encryption: <a href="https:&#x2F;&#x2F;github.com&#x2F;Steppenwolfe65&#x2F;eAES">https:&#x2F;&#x2F;github.com&#x2F;Steppenwolfe65&#x2F;eAES</a>