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Cloudflare (cloudflare.com): Post-Quantum TLS Check

Does Cloudflare (cloudflare.com) support post-quantum TLS 1.3 with X25519MLKEM768?

Yes. In our latest test on , cloudflare.com negotiated the hybrid post-quantum key exchange X25519MLKEM768. Observed Source · Methodology

Stated by the source Yes stated on the source page · Sep 27, 2026 Tested Yes Observed · X25519MLKEM768 Result Match

What this means for you

In our TLS 1.3 test of cloudflare.com on Oct 18, 2026, the server chose X25519MLKEM768, a hybrid key exchange that combines classical X25519 with ML-KEM-768, the NIST FIPS 203 post-quantum standard. A browser that offers the same group can get the same key exchange; the session keys of such a connection are designed to resist decryption later with a quantum computer, even if the traffic is recorded today.

This check covers the website at cloudflare.com, not every site or server Cloudflare runs for its customers. Cloudflare prices we check: Cloudflare Pro.

History and how we checked

30 checks since Sep 27, 2026 · no change

How we got this number

  • What we tested: a TLS 1.3 connection to cloudflare.com; we record the key exchange the server chooses. Source: developers.cloudflare.com/ssl/post-quantum-cryptography
  • Checked: ; tracked since Sep 27, 2026
  • Shown in: Switzerland
  • Checks so far: 30 checks on 22 days since Sep 27, 2026
  • What changed: no change since Sep 27, 2026
  • Page updated:

Changes

  1. — First check: Yes
all websites and APIs served through Cloudflare over TLS 1.3 support post-quantum hybrid key agreement.
What the source says · developers.cloudflare.com
Record history 30 records for 1 question
Last record
Shown in
Switzerland
TimeValueStatus
Oct 18, 2026YesObserved
Oct 17, 2026YesObserved
Oct 16, 2026YesObserved
Oct 15, 2026YesObserved
Oct 14, 2026YesObserved
Oct 13, 2026YesObserved
Oct 12, 2026YesObserved
Oct 11, 2026YesObserved
Oct 10, 2026YesObserved
Oct 9, 2026YesObserved
Oct 8, 2026YesObserved
Oct 7, 2026YesObserved
Oct 6, 2026YesObserved
Oct 5, 2026YesObserved
Oct 4, 2026YesObserved
Oct 3, 2026YesObserved
Oct 2, 2026YesObserved
Oct 1, 2026YesObserved
Sep 30, 2026YesObserved
Sep 29, 2026YesObserved
Sep 28, 2026YesObserved
Sep 28, 2026YesObserved
Sep 28, 2026YesObserved
Sep 28, 2026YesObserved
Sep 28, 2026YesObserved
Sep 28, 2026YesObserved
Sep 27, 2026YesObserved
Sep 27, 2026YesObserved
Sep 27, 2026YesObserved
Sep 27, 2026YesObserved
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