A
Post-quantum TLS readiness
threema.ch
Ready: quantum-resistant key exchange
Short answer
Yes. As of 2026-11-09, threema.ch negotiates the hybrid post-quantum key exchange X25519MLKEM768 over TLSv1.3 (Quantum Aether grade A).
| Grade | A |
|---|---|
| Key exchange | X25519MLKEM768 |
| Post-quantum | yes |
| TLS | TLSv1.3 |
| Hosting network | Nine Internet Solutions AG |
| Tranco rank | #1071 |
| Country | 🇨🇭 Switzerland: #8/24 (61.3%) |
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 | A | X25519MLKEM768 | yes |
| 2026-W45 | A | X25519MLKEM768 | yes |
Show your readiness on your site
Markdown
[](https://ather-quantum.com/verify/threema.ch)