Advanced Cybersecurity & Threat Landscape
Quantum-Resistant Cryptography
Quantum computers threaten RSA and ECC key exchange through Shor's algorithm, and harvested ciphertext can be decrypted later once the hardware arrives. Post-quantum cryptography replaces those primitives with algorithms believed to resist quantum attacks. The migration is long and touches certificates, TLS, VPNs, and stored secrets, so it has to start with inventory, not deployment.
Vigtige pointer
- Inventory every use of RSA and ECC across TLS, SSH, code signing, and at-rest encryption.
- Track NIST standardized algorithms such as ML-KEM, ML-DSA, and SLH-DSA and vendor support timelines.
- Plan hybrid key exchange that combines a classical and a post-quantum algorithm during the transition.
- Prioritize long-lived secrets and data with multi-decade sensitivity for early migration.
- Test post-quantum TLS in staging before forcing it on clients that may not support it.
- Update certificate authorities and internal PKI to issue post-quantum certificates on a phased schedule.
- Measure performance impact, since larger keys and signatures affect handshake latency and bandwidth.
- Document a rollback path for clients that fail to negotiate the new algorithms.
Ofte stillede spørgsmål
When will quantum computers break current crypto?
No one knows exactly; estimates range from years to decades, but harvested data makes the risk present today.
Do I need to replace all certificates now?
No. Start with inventory and hybrid deployments, then migrate by sensitivity and lifecycle as vendor support matures.
What about symmetric encryption like AES?
AES-256 is considered quantum-resistant with larger key sizes; the urgent work is asymmetric key exchange and signatures.
Is this only a government concern?
No. Any data that must stay confidential for decades, including health and financial records, is at risk from harvest-now-decrypt-later.
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