# What do we gain by migrating to post-quantum cryptography?

You protect today's traffic from tomorrow's decryption, and you get several gains that do not depend on quantum computers at all. Data with a long shelf life stops being exposed to harvest now, decrypt later as soon as its key exchange moves to a hybrid method. The inventory you build along the way finds old TLS versions, weak ciphers, expired or forgotten certificates and unmanaged servers, which are risks today. Building crypto-agility, the ability to change algorithms by configuration, makes the next forced change cheaper, whatever triggers it. Commercially, you can answer tender and customer questions with facts and dates instead of a blank, and you are ready when national authorities turn the EU roadmap into guidance. Done within normal replacement cycles, the migration costs far less than one done under time pressure. What you do not gain is immunity: post-quantum cryptography protects key exchange and signatures, not stolen passwords, phishing or unpatched systems.

FAQ: [Post-quantum cryptography](https://netsenx.com/en/faq/pqc) · https://netsenx.com/en/faq/what-do-we-gain-by-migrating-to-post-quantum-cryptography

## Read next

- https://netsenx.com/en/encrypted-traffic-analysis
- https://netsenx.com/en/features
- https://netsenx.com/en/blog/2026-10-27_harvest-now-decrypt-later

## Related questions

- [What can go wrong in a post-quantum migration?](https://netsenx.com/en/faq/what-can-go-wrong-in-a-post-quantum-migration)
- [What is crypto-agility?](https://netsenx.com/en/faq/what-is-crypto-agility)
- [Do SSH and VPNs support post-quantum key exchange?](https://netsenx.com/en/faq/do-ssh-and-vpns-support-post-quantum-key-exchange)
- [How can we find where we use quantum-vulnerable cryptography?](https://netsenx.com/en/faq/how-to-find-quantum-vulnerable-cryptography)
- [Can a network sensor build a cryptographic inventory?](https://netsenx.com/en/faq/can-a-network-sensor-build-a-cryptographic-inventory)