Most websites today rely on encryption that a sufficiently powerful quantum computer could break. Post-quantum cryptography uses algorithms designed to resist both classical and quantum attacks.
This is something I spent a lot of time on while I was at Cloudflare. We were pushing post-quantum cryptography into Zero Trust and across the entire network well before most companies were even thinking about it. Cloudflare has been rolling out post-quantum key agreement across its entire network, and if your site is behind Cloudflare, there's a good chance it already supports it.
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