Post-quantum for devs: what you need to know without becoming a cryptographer

You don't need to understand quantum math to prepare. The practical idea is crypto-agility: being able to swap algorithms without rewriting the whole system.

The risk (in plain language)

Current algorithms (RSA, ECDH, etc.) may become vulnerable in the future with quantum computing. Anyone who already abstracts and centralizes crypto use can swap algorithms with less pain.

Crypto-agility in practice

Centralize crypto in services or modules. Avoid hardcoded algorithms scattered around. Make key rotation routine, not a rare event.

Plan in 3 steps

1. Inventory: where do you use cryptography? (JWT, TLS, hashing, keys, storage). 2. Abstraction: a single place for crypto operations. 3. Rotation: documented and tested key rotation process. Crypto-agility discipline already reduces incidents today.

Key takeaways

Crypto-agility is the practical preparation for post-quantum. Inventory, abstraction and rotation are the three steps.

Read also

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FAQ

Do I need to change everything now? No. What matters is being able to change in the future. Abstracting and having an inventory is the first step.

What about TLS? TLS already evolves with new cipher suites; keep libraries and servers up to date.