F
Post-quantum TLS readiness
homeoffice.gov.uk
Critical issue to fix first
Short answer
Yes. As of 2026-11-09, homeoffice.gov.uk negotiates the hybrid post-quantum key exchange X25519MLKEM768 over TLSv1.3 (Quantum Aether grade F).
| Grade | F |
|---|---|
| Key exchange | X25519MLKEM768 |
| Post-quantum | yes |
| TLS | TLSv1.3 |
| Hosting network | Fastly, Inc. |
| Tranco rank | #6006 |
| Country | 🇬🇧 United Kingdom: #6/24 (62.3%) |
From our weekly tracker of the top 10,000 sites, scanned on 2026-11-09 · /adoption
Weekly history
| Week | Grade | Key exchange | Post-quantum |
|---|---|---|---|
| 2026-W46 | F | X25519MLKEM768 | yes |
| 2026-W45 | F | X25519MLKEM768 | yes |
Show your readiness on your site
Markdown
[](https://ather-quantum.com/verify/homeoffice.gov.uk)