B
Post-quantum TLS readiness
seznamzpravy.cz
Secure today, exposed to harvest-now-decrypt-later
Short answer
No. As of 2026-11-09, seznamzpravy.cz does not negotiate post-quantum key exchange; it uses x25519 over TLSv1.3 (Quantum Aether grade B), so recorded traffic is exposed to harvest-now-decrypt-later.
| Grade | B |
|---|---|
| Key exchange | x25519 |
| Post-quantum | no (classical) |
| TLS | TLSv1.3 |
| Hosting network | Seznam.cz, a.s. |
| Tranco rank | #7004 |
| Country | 🇨🇿 Czechia: #21/24 (40.0%) |
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 | B | x25519 | no |
| 2026-W45 | B | x25519 | no |
Show your readiness on your site
Markdown
[](https://ather-quantum.com/verify/seznamzpravy.cz)