PQC & Cryptography

10 diagrams: Inventory, hybrid key exchange, cert migration, HNDL defense.

Harvest-now-decrypt-later is already in your threat model — this is the migration map.

Cryptographic Inventory

You cannot migrate what you have never actually catalogued.

Neither algorithm alone is fully trusted yet — that’s exactly the point.

Cross-signed certificates let old and new trust chains coexist during the transition.

The data being stolen today is being stolen for a decryption key that doesn’t exist yet.

A VPN tunnel that outlives the classical algorithm protecting it is a tunnel worth re-examining today.

Eavesdropping on this channel doesn’t just risk detection — it physically disturbs the very thing being measured.

Standardized doesn’t mean interchangeable — each algorithm trades off differently.

Code signed today may still need to verify as authentic a decade from now.

A device with no field-upgrade path has effectively already made its cryptographic decision for its entire operational life.

The next migration should be a configuration change, not a rewrite.