Industry & Era
Harvest Now, Decrypt Later
A security concern where encrypted data is collected today with the intention of decrypting it once sufficiently powerful quantum computers exist.
Definition
'Harvest now, decrypt later' describes a forward-looking security threat: adversaries intercept and store currently-encrypted data today, anticipating that future quantum computers running Shor's Algorithm could eventually break the encryption protecting it, even though no such quantum computer exists yet.
Technical Definition
This concern is the primary justification for organizations to migrate to post-quantum cryptography standards now, well ahead of when large-scale fault-tolerant quantum computers are expected, particularly for data with long required confidentiality lifetimes.
Visual Explanation: An Analogy
Think of it like a thief stealing a locked safe today, confident that a much better lock-picking tool will eventually be invented — they're willing to wait years to open it, as long as the contents remain valuable when that tool arrives.
Real-World Use Cases
- The primary driver behind government and financial institution post-quantum cryptography migration timelines
- Particularly relevant for data needing decades-long confidentiality, like state secrets or long-term medical records