Free tool
How exposed is your encrypted data to a future quantum adversary?
Data encrypted with classical cryptography today can be captured now and stored for later - then decrypted once a cryptographically relevant quantum computer exists. This free calculator gives you an illustrative read on your harvest-now-decrypt-later exposure in under a minute.
The threat
What is harvest-now-decrypt-later?
Harvest-now-decrypt-later (HNDL) is a patient attack. An adversary records encrypted traffic or exfiltrates encrypted data today, holds it and waits for the cryptography protecting it to become breakable. The data does not need to be readable now - only later, within the window it must stay confidential.
01 · Harvest
Capture encrypted data now
An adversary records encrypted sessions or copies encrypted archives. Classical encryption keeps it unreadable for now - so the capture often goes unnoticed.
02 · Store
Hold it until crypto is weak
Storage is cheap. The harvested ciphertext simply waits. The risk grows with how long your data has to stay confidential, not with how long ago it was captured.
03 · Decrypt later
Decrypt once quantum arrives
A cryptographically relevant quantum computer could break classical key exchange such as RSA and ECC. At that point, anything harvested earlier and still sensitive becomes readable.
Why the key exchange matters most
HNDL exposure is driven by how your session keys are negotiated. Classical RSA and ECC key exchange can, in principle, be recovered by a future quantum computer - so harvested ciphertext is at risk. A hybrid or post-quantum key exchange protects the session key against that threat, so harvested data stays protected.
HNDL risk calculator
Estimate your exposure
Set three inputs and the calculator returns an illustrative HNDL risk level instantly, in your browser. Nothing is uploaded or stored. This is an educational estimate based on commonly cited quantum-threat timelines - not a guarantee and not a scan of your environment.
Illustrative HNDL risk level
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Illustrative estimate based on commonly cited quantum-threat timelines and public migration roadmaps. Not a guarantee that any system will or will not be broken by a specific date.
How to read this
The result is a directional estimate, not a measurement. It assumes the commonly cited view that a cryptographically relevant quantum computer is plausible within the coming decades - public roadmaps and analyses often point to the 2030s - while no precise date is known or claimed. A real assessment of your estate needs discovery, which is what the EQCore platform does.
What the result means
An illustrative signal, not a verdict
The risk level is a starting point for a conversation, framed against commonly cited quantum-threat timelines. It tells you where to look first - it does not measure your actual cryptography.
01
The window is the variable you control
You cannot change when quantum computing matures, but you set how long your data must stay secret. The longer that window, the more it overlaps the commonly cited threat horizon.
02
The key exchange is the lever
Moving classical key exchange to a hybrid or post-quantum mechanism is what actually reduces HNDL exposure. NIST has standardised ML-KEM for exactly this.
03
A real answer needs discovery
This calculator works off three assumptions you provide. Knowing your true exposure means discovering the cryptography you actually run - the job of CipherScout™ inside EQCore.
Honest note
This free tool is an educational estimate. It does not scan, connect to or inspect your systems and it cannot see your real cryptography. Any horizon it implies is illustrative and based on commonly cited timelines, never a precise prediction. For a real read on your estate, run a scoped EQCore discovery.
Get the full breakdown
Get the full risk breakdown and mitigation steps
The calculator gives you the instant signal. Enter your work email and we will send the full HNDL risk breakdown - what drives each risk level, how the quantum-threat timelines are commonly framed and the concrete mitigation steps for moving classical key exchange to post-quantum.
See your real HNDL exposure, not an estimate
Run a scoped EQCore discovery to find the classical key exchange across your estate and get a prioritised post-quantum migration roadmap.