Post-Quantum Cryptography: What Security Teams Need to Know Before 2030

The argument for starting post-quantum migration now, before a cryptographically relevant quantum computer exists, is not speculative. It is "harvest now, decrypt later": data encrypted today with RSA or ECC can be captured and stored by an adversary, sitting inert until a sufficiently capable quantum computer can break it. For data that needs to stay confidential for years, health records, government communications, long-lived intellectual property, that future decryption risk is already live today, regardless of when the quantum computer itself arrives.

What "quantum-vulnerable" actually means

RSA and ECC, the asymmetric algorithms underpinning most of today's key exchange and digital signatures, are the ones at risk. Symmetric algorithms like AES-256 and hash functions like SHA-256 are far more resistant and are not the priority for migration, though key sizes may still warrant review.

NIST has already standardized the replacements

NIST's Post-Quantum Cryptography project has published standardized algorithms, including Kyber for key encapsulation and Dilithium for digital signatures, giving organizations concrete targets to migrate toward rather than a moving research target. This is a rare case where the "what do we migrate to" question already has an authoritative answer; the harder question is "where in our environment is the vulnerable cryptography actually deployed."

Migration starts with an inventory you probably don't have

• Build a cryptographic asset inventory: which systems use RSA/ECC, where certificates and keys live, which vendors and protocols depend on them.
• Run a HNDL (harvest-now-decrypt-later) assessment focused on data with a long confidentiality shelf life.
• Prioritize migration by exposure and data sensitivity, not by convenience.
• Build migration into normal certificate and system refresh cycles instead of treating it as a standalone emergency project.

Ongoing research into new schemes

Post-quantum cryptography research is still active well beyond the NIST-standardized set. Dr. Abeer Alshammari's own preprint, Design of Turbo-NAFS: A Quantum-Resilient Encryption Scheme Based on Functional Superposition, is one example of the kind of exploratory work happening in this space, proposing an additional encryption approach designed with quantum resistance in mind. Research like this matters for the field even before (or if) it becomes a standardized, deployable algorithm, because the standardized set NIST has published today is not guaranteed to be the final word.

The organizations that will handle this transition well are the ones that start the inventory now, while there is no deadline pressure, rather than waiting for a forcing event.