Hybrid Post-Quantum Key Agreement
Standardised protocol-level combination of classical and post-quantum key exchange within secure transport sessions, letting connections stay interoperable and compliant with existing assurance regimes while gaining protection against future quantum decryption of recorded traffic.
Developed mainly in: United Kingdom and United StatesImpacting: North America, Europe, Rest of Asia and India
GeoTrust's SSL Monitor deep-scanned 973,441 of the million most-visited sites in October 2026 and found 61.3% (596,914) negotiating the hybrid post-quantum key agreement X25519MLKEM768. Excluding Cloudflare-fronted domains the share falls to 33.6%. Fully post-quantum certificates remain unavailable for public sites.
This is one of 32 signals scored today.
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First flagged
15 October 2026 · score 6.0/10
Corroborating sources since flagging
4
Latest signals
Tracked from 2 signals, each traced to its source.
- Hybrid post-quantum key exchange now offered by most top websites
Geotrust · 3 Nov 2026
- UK cyber agency issues post-quantum TLS configuration recommendations after IETF hybrid standard
Ncsc · 15 Oct 2026
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