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Automatic Key Exchange: faster, post-quantum secure origin handshakes for 45 billion daily connections (and counting)

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Automatic Key Exchange: faster, post-quantum secure origin handshakes for 45 billion daily connections (and counting)

Cloudflare Blog · Official source · Sep 8, 2026, 1:10 PM UTC

Automatic Key Exchange probes TLS 1.3-capable customer origins to learn which key agreement algorithms they support. We then lead with the most secure algorithm when connecting to the origin, preferring post-quantum connections wherever the origin supports it.