Within the ever-evolving panorama of cybersecurity, HNDL (Harvest Now, Decrypt Later) is rising as a silent however severe menace. It doesn’t require an attacker to interrupt encryption at the moment—it simply bets that they are going to be in a position to take action tomorrow.
What’s HNDL?
HNDL is a long-term knowledge breach technique wherein adversaries intercept and retailer encrypted knowledge at the moment, with the intention of decrypting it sooner or later when computing energy—significantly quantum computing—makes breaking present cryptography possible. The worth of the info doesn’t must be rapid. Delicate medical data, confidential enterprise contracts, protection communications, or citizen knowledge can all retain strategic worth years down the highway.
Why Ought to You Be Involved?
- Quantum computing isn’t science fiction anymore. Progress is accelerating, and whereas sensible quantum decryption should be years away, menace actors (together with state-sponsored teams) are already getting ready by harvesting knowledge now.
- Most encryption used at the moment (like RSA and ECC) will ultimately be susceptible to quantum assaults except up to date with post-quantum cryptography (PQC).
- You could by no means understand it’s taking place. In contrast to ransomware or denial-of-service assaults, HNDL leaves no rapid hint.
What Ought to Organizations Do?
You don’t want a crystal ball to defend in opposition to future dangers—you want a roadmap. Right here’s act now:
1. Stock and Classify Your Cryptographic Property
- Begin with a crypto-agility evaluation: Establish all situations of cryptographic use throughout your infrastructure, together with TLS, VPNs, inner apps, backups, and cloud integrations.
- Categorize the knowledge sensitivity and longevity of confidentiality required. Something that should keep confidential for greater than 3-5 years is probably in danger from HNDL.
2. Prioritize Lengthy-Lived, Excessive-Sensitivity Site visitors
- VPN tunnels, database backups, and software program distribution methods are prime targets for HNDL.
- Site visitors between core methods and long-term logs are particularly susceptible.
3. Undertake Put up-Quantum Cryptography The place It Issues Most
- Start testing or deploying hybrid cryptographic protocols (e.g., classical + PQC) that meet each present and future safety wants.
- Search for standards-compliant options like these aligned with NIST’s FIPS 203/204/205 (for ML-KEM, ML-DSA, and SLH-DSA).
4. Demand PQC Roadmaps from Your Distributors
- Ask your safety distributors and infrastructure suppliers what they’re doing to help PQC and mitigate HNDL.
- Search interoperability assessments and pilot deployments—don’t look ahead to full productization.
5. Shield the Channel, Not Simply the Endpoint
- Even when your endpoints are safe, visitors in transit is susceptible to interception.
- Safe communication channels (IPsec, TLS, MACsec) ought to evolve to help PQC as a prime precedence.
Remaining Thought
HNDL isn’t only a future downside—it’s a gift threat disguised by time. Organizations that wait till quantum computer systems are absolutely operational will have already got misplaced the battle for his or her previous knowledge. The time to behave is now.
In case you are headed for the #RSAC, you possibly can study extra from the Cisco session on Architecting the Way forward for Safety by Cisco Thought Chief Tim Rowley on Tuesday, April twenty ninth 2025 at 10:30 am on the Cisco Safety Sales space #N5845. We’d love to attach and trade concepts as we put together for the brand new frontiers in safety.
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