Co-Authored by Luiz Parente
Your data might be safe today. But that doesn’t mean it’s safe forever.
A growing number of sophisticated actors are collecting encrypted data now, with the goal of decrypting it later, when more powerful technology becomes available.
This strategy is known as Harvest Now, Decrypt Later (HNDL). And it’s not a future problem. It’s already happening, according to research from our McAfee VPN team.
For everyday people, that means private messages, financial records, and sensitive documents could be exposed years from now if protections don’t evolve today.
That’s why security teams, including McAfee’s VPN engineers, are already working on ways to strengthen encryption for both today and what comes next.
What “Harvest Now, Decrypt Later” Means
At its core, HNDL is simple: Attackers collect encrypted data now, store it, and wait until they have the tools to unlock it later.
Even though today’s encryption is incredibly strong, the strategy doesn’t rely on breaking it today. It relies on patience.
A Simple Way to Think About It
You put valuable belongings and documents in a safe at home that’s locked and secured. This works at preventing crimes of opportunity. But let’s say there’s a thief who steals the entire safe, knowing they have tools they can use later to access what’s inside. They wait, and once the tools are available, they break into your safe and access everything inside.
That’s one way to think of HNDL. The safe is the encryption. The quantum computing is the tool they can use later.
But in real life, you’d probably notice if your safe is gone. In the case of HNDL, if you’re not monitoring your data, you may not even notice encrypted information has been stolen to be decrypted.
Key Terms Explained
| Term |
What it means |
| Encryption |
Scrambling data so others can’t read it |
| Quantum computing |
A new type of computing that can break some encryption |
| HNDL |
A strategy to collect encrypted data now and decrypt it later |
Why This Matters Right Now
This isn’t about whether your data is valuable today. It’s about whether it might be valuable later.
Data with a long shelf life is especially at risk, including:
- Financial records
- Medical information
- Private messages
- Legal or identity documents
Even something that feels low-stakes today could become sensitive in the future.
And because the collection phase is already happening, the risk isn’t hypothetical. It’s already in motion.
How This Affects VPNs (and what doesn’t change)
VPNs remain one of the most effective ways to protect your data today. That hasn’t changed.
But HNDL introduces a new layer of complexity.
- What’s still strong: The encryption that protects your data in transit remains highly resilient.
- Where the risk is: The “handshake” process (how a secure connection is established) is more vulnerable to future quantum attacks.
In simple terms: Your data is well protected today, but parts of how that protection is set up may need to evolve for the future.
What Quantum Computing Changes
Traditional computers process information in a linear way.
Quantum computers work differently. They can solve certain types of problems much faster, including the kinds of mathematical challenges that protect today’s encryption.
That’s why attackers are willing to wait.
Once quantum computing reaches a certain level, it could unlock data that was previously considered secure.
What McAfee’s VPN Team is Working On
McAfee’s VPN team is already preparing for this shift.
- Evaluating quantum-safe encryption approaches
- Exploring hybrid models that protect both now and long-term
- Building toward a more resilient VPN experience
This work builds on a broader privacy-by-design approach, where systems are designed to minimize risk from the start, not react after the fact.
Because with HNDL, waiting isn’t an option.
What You Can Do Now
You don’t need to wait for quantum computing to take steps today.
- Use a trusted VPN to encrypt your connection
- Be mindful of long-term sensitive data you share online
- Avoid unsecured public Wi-Fi when possible
- Keep your apps and devices updated
These steps help protect your data now while the industry builds toward future-ready security.
How McAfee Helps Protect You
McAfee+ Advanced gives you multiple layers working together so you are not left figuring it out after the damage is done:
- Identity Monitoring alerts you if your personal info shows up where it should not, so you can act fast
- Personal Data Cleanup helps remove your information from data broker sites, making you harder to target in the first place
- Scam Detector flags suspicious texts, emails, links, and even deepfake videos before you engage
- Safe Browsing helps block risky sites if you do click
- Device Security helps detect malicious apps or downloads
- Secure VPN keeps your data private, especially on public Wi-Fi
Frequently Asked Questions (FAQs)
| FAQ |
| Q: Is my data safe right now?
A: In most cases, yes—today’s encryption is extremely strong and is designed to protect your data from current threats. If you’re using trusted security tools like a VPN, safe browsing protections, and device security, your data is actively protected while it’s in transit and in use. However, no system is risk-free. Data exposed through phishing, weak passwords, breaches, or unsecured networks may still be vulnerable. And with “Harvest Now, Decrypt Later,” even properly encrypted data could be collected today and targeted for decryption in the future. |
| Q: What is quantum-safe encryption?
A: Quantum-safe (or post-quantum) encryption refers to new types of cryptography designed to remain secure even against future quantum computers. Today’s encryption relies on math problems that are extremely difficult for classical computers to solve, but quantum computers could eventually solve some of them much faster. Quantum-safe approaches use different mathematical foundations that are believed to resist those capabilities. In practice, many companies are moving toward hybrid encryption, combining today’s proven methods with newer quantum-resistant techniques to protect data both now and long-term. |
| Q: Should I still use a VPN?
A: Yes. A VPN remains one of the most effective ways to protect your data today, especially on public or unsecured networks. It encrypts your internet traffic and helps prevent interception by hackers, internet providers, or other third parties. While VPN protocols are evolving to address future quantum risks, they still provide strong, essential protection against today’s threats. |
| Q: When will this become a real threat?
A: The risk unfolds in two phases. The collection phase is already happening today, where sophisticated actors gather encrypted data and store it. The decryption phase depends on when quantum computing advances far enough to break certain types of encryption, which could take years but is actively progressing. This means data with a long lifespan, such as financial records, personal communications, and sensitive documents, is most at risk because it only needs to remain valuable until those capabilities exist. |
The post Why Hackers Are Collecting Data They Can’t Read Yet. And How to Stay Safe appeared first on McAfee Blog.
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