Harvest Now, Decrypt Later: Why Post-Quantum Cryptography Can't Wait

Science fiction? Adversaries are actively gathering and storing encrypted data now, believing that future quantum computers will eventually crack today's encryption. This isn't just theory; it's a real threat happening right now. If you're in charge of security, you need to act immediately, not wait for quantum computers to arrive.

All data with a lifespan beyond five to ten years is already at risk. The math behind RSA and elliptic curve cryptography protects against classical computers, but quantum computers could break these algorithms in hours. This timeline is uncertain, but the problem is the uncertainty itself. Nations and skilled hackers are systematically collecting encrypted data now, planning to decrypt it later.

Most security teams excel at addressing immediate threats. A new vulnerability pops up, and patches are deployed quickly. But quantum computing threats are different. They're not immediate, not obvious, and not causing damage yet, creating a dangerous lack of urgency. Most teams are busy with firewalls, SIEM platforms, threat intelligence, and compliance audits.

Post-quantum cryptography (PQC) feels abstract and isn't a priority. But here's the harsh truth: your encryption might be a mess. Have you audited every encryption algorithm in your infrastructure? Do you know which use RSA-2048 and which use stronger variants? Can you find all places where elliptic curve cryptography is used? Most can't answer these questions.

The NIST post-quantum cryptography standardization process, completed in 2022, marks a crucial turning point. Four algorithms—ML-KEM (Kyber), ML-DSA (Dilithium), SLH-DSA (SPHINCS+), and Falcon—resist both classical and quantum attacks. But moving to PQC isn't just a patch and pray solution. It requires cryptographic agility, hybrid approaches, key rotation at scale, and vendor coordination. This migration isn't a sprint, it's a well-planned process.