F
Post-quantum TLS readiness
caltech.edu
Critical issue to fix first
Short answer
No. As of 2026-11-03, caltech.edu does not negotiate post-quantum key exchange; it uses x25519 over TLSv1.3 (Quantum Aether grade F), so recorded traffic is exposed to harvest-now-decrypt-later.
| Grade | F |
|---|---|
| Key exchange | x25519 |
| Post-quantum | no (classical) |
| TLS | TLSv1.3 |
| Hosting network | Amazon.com, Inc. |
| Tranco rank | #3098 |
From our weekly tracker of the top 10,000 sites, scanned on 2026-11-03 · /adoption
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[](https://ather-quatum.cloud/?domain=caltech.edu)