A Glimpse of Things That Could Happen
For years, Ron thought his data was safe just because it was encrypted. Then on a random Tuesday, his medical records, social security number, private communications — everything he had ever uploaded to his secure cloud were leaked. He was warned about quantum computers arriving by 2029 but did nothing.
The encryption had held, but attackers were silently collecting and storing his encrypted data for years. When quantum computers arrived, they cracked thousands of users' data , including Ron's in minutes. All of it could have been prevented if Ron had upgraded to quantum-resistant storage.
What is the Harvest Now, Decrypt Later?
Harvest Now, Decrypt Later (HNDL) is a cyberattack strategy where attackers collect and store your encrypted data today. Even though they can't read it, they know that future quantum computers will be able to break through it. The above example is just a glimpse of how things could go wrong without post quantum encryption.
In 1994, Shor's algorithm proved how quantum computers could break RSA encryption if it became powerful enough. Previously, quantum computers were only fiction but now the PQC threat is more real than ever. Once they mature, everything harvested by the attackers could be cracked within minutes.
How a Harvest Now, Decrypt Later (HNDL) Attack Works?
With the threat of harvest now, decrypt later or store now decrypt later (SNDL) lurking, sensitive data is at most risk. Government documents, military secrets, health records among others are already being moved to secure platforms. HNDL essentially works on the vulnerability of classical cryptography at the hands of powerful quantum computers.
Here are some key steps as to how SNDL or HNDL attack works :
Intercept
Attackers intercept vast amounts of encrypted data like emails, sessions or cloud storage transfers without triggering any alarms
Store
Even though this encrypted data is useless to them at the moment, they store it and wait patiently for the perfect moment.
Decrypt
After the long game, attackers will finally use powerful quantum computers to crack the encryption in minutes. Everything which once appeared "secure" is now exposed and lost instantly.
What is Q-Day and When Will Quantum Computers Break Encryption?
To put it simply, Q-Day refers to Quantum Day, the particular moment when long-awaited quantum computers come to life. This cyber threat deadline marks the future moment when quantum computers will break classical cryptography. While there were rumours about its arrival by 2035, it may arrive by the end of this decade.
Earlier, such powerful computers and Q-day quantum existed only as plots in science fiction novels. However, according to Google and Cloudflare's timeline, quantum computers may arrive as early as 2029. Big corporations and users who truly value their data have already made the switch to quantum-resistant platforms.
Who is at Risk from HDNL Attacks?
Everyone who stores their files online and transmits sensitive data is at risk from HDNL attacks. Previously, end-to-end encryption did the job but now encrypted data is vulnerable as quantum computers arrive. For this reason, post quantum cryptography especially in cloud storage and email platforms are extremely important.
While everyone is vulnerable, certain groups dealing with sensitive information are made greater targets of -
Government Departments
classified information, nation records and communications
Military Agencies
national security data, confidential weaponry and nuclear codes
Financial Institutions
transaction records, account credentials and customer data
Healthcare Providers
medical records, social security numbers and insurance data
Cloud Storage Platforms
proprietary research, private files or user credentials
Legal Professionals
law firms, accounting firms and consultancies
How to Stay Secure Against Harvest Now, Decrypt Later
The easiest and most simple way to stay secure against HNDL attacks is switching to quantum resistant platforms. For instance, DragBin is among the world's first client side quantum resistant encryption ( ML-KEM + AES-256) cloud storage drives. Your data stays secure today, tomorrow and always even when powerful quantum computers arrive.
DragBin uses the National Institute of Standards and Technology's finalised ML-KEM post-quantum key encapsulation mechanism. We have published our own technical whitepaper detailing how our security architecture works. On top of end-to-end encryption, we offer an additional post-quantum layer so your data stays secure, forever.
How DragBin's Security Protects You from HDNL Attacks
At DragBin, we offer a true zero knowledge security architecture to protect your files. Nobody, not even we can see your files, filenames, folders or passwords due to metadata protection. Using client side encryption, your files are encrypted on your device before it reaches the server, meaning only you hold the encryption keys.
Metadata Protection
Nobody (not even DragBin) can see your passwords, files, filenames, or folders.
Client Side Encryption
Files are encrypted directly on your device before reaching the cloud.
ML-KEM Keys
Post-quantum key establishment mechanism for secure connections.
AES-256 Security
Trusted symmetric encryption standard for robust protection.
Post Quantum Encryption vs Classical encryption
Classical encryption algorithms like RSA, ECC, and AES rely on the idea that factoring large prime numbers is infeasible for classical computers. This assumption has protected sensitive data for decades but will not stand the test of time. DragBin acts early by offering quantum-resistant encryption so your data stays secure even after Q-Day.
| Feature | Classical Encryption | Post-Quantum Encryption |
|---|---|---|
| Security Basis | Relies on mathematical problems like factorization and discrete logs | Built on quantum-resistant problems like lattices and hash-based schemes |
| Quantum Vulnerability | Breakable with quantum algorithms like Shor's Algorithm | Designed to resist both classical and quantum attacks |
| Longevity | Secure today, vulnerable in the near future | Future-proof against emerging quantum capabilities |
| Attack Model | Assumes attackers use classical computing power | Assumes attackers may use quantum computers |
| Data Risk | Exposed to "harvest now, decrypt later" threats | Protects data even if intercepted and stored today |