There are post-quantum cryptographic algorithms already, eg.
<a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Supersingular_isogeny_key_exchange" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Supersingular_isogeny_key_exch...</a>