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A sufficiently capable quantum computer could break some cryptographic protections used today, but no one knows when such a machine will exist. The practical response is already underway: NIST has finalized three post-quantum cryptography standards, and organizations need to plan how to adopt them. For people and businesses with information that must remain secret for years, the risk also includes attackers collecting encrypted data now in hopes of decrypting it later.
What could a quantum computer actually put at risk?
Encryption and digital signatures help protect information and verify who or what sent it. The concern is that a sufficiently capable quantum computer could break cryptographic systems built on mathematical problems that are difficult for conventional computers. That would threaten some of the protections used to keep data confidential and to authenticate digital activity.
This is a possible future capability, not evidence that current encryption has already been broken. NIST says the arrival date of a cryptographically relevant quantum computer is unknown and that estimates vary widely. The risk is about particular cryptographic methods—not every password, account, or computer becoming instantly vulnerable.
Quantum-resistant cryptography is therefore a migration challenge as well as a technology challenge. NIST notes that integrating a standardized algorithm into information systems has historically taken 10 to 20 years. That is general historical context, not a promise or forecast for any organization’s post-quantum migration.
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Why encrypted data collected today can still matter
“Harvest now, decrypt later” describes an attacker collecting encrypted information now and retaining it in the hope of decrypting it with a future quantum computer. It does not mean every encrypted message is being collected, or that current encryption has already failed.
The key question is how long a particular piece of information must remain secret. Data whose confidentiality matters for many years may deserve earlier attention than information that quickly loses sensitivity. That makes data sensitivity and secrecy lifetime practical ways for organizations to prioritize preparation.
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What post-quantum cryptography means
Post-quantum cryptography (PQC) is a set of mathematical algorithms intended to resist attacks from both conventional and quantum computers. These algorithms can run on existing computing platforms; adopting PQC does not require an organization or an individual to buy a quantum computer.
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| Standard | Algorithm | Purpose | Status |
|---|---|---|---|
| FIPS 203 | ML-KEM | Key establishment for general encryption | Finalized by NIST in 2024 |
| FIPS 204 | ML-DSA | Digital signatures | Finalized by NIST in 2024 |
| FIPS 205 | SLH-DSA | Digital signatures using a different mathematical approach from ML-DSA | Finalized by NIST in 2024 |
| HQC | HQC | Prospective backup for ML-KEM for general encryption | NIST selected it in March 2025; NIST then expected a final standard in 2027. It is not a finalized standard in that announcement. |
NIST continues to recommend ML-KEM for general encryption. It selected HQC as a possible backup because HQC uses a different mathematical approach, which could provide an alternative if ML-KEM were found vulnerable. In announcing the selection, NIST mathematician Dustin Moody said organizations should continue migrating their encryption systems to the standards finalized in 2024.
How PQC differs from quantum key distribution
Post-quantum cryptography and quantum key distribution (QKD) are not two names for the same solution. PQC changes the mathematical algorithms used by cryptographic systems; QKD uses quantum-mechanical properties and specialized technology to distribute keying material.
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| Approach | How it works | Deployment model | Guidance and limitations |
|---|---|---|---|
| PQC | Uses algorithms intended to resist classical and quantum attacks | Implemented on existing computing platforms | NIST’s three finalized standards are available for implementation |
| QKD | Uses quantum-mechanical properties to distribute keying material | Requires specialized quantum communications technology | The NSA does not recommend QKD or quantum cryptography for National Security Systems unless specified limitations are overcome; it also cautions that security depends on implementation |
QKD is not the ordinary consumer route for preparing systems for quantum-era threats. The standards-based PQC transition is a separate effort and does not depend on deploying quantum communications equipment.
What organizations should do to prepare
NIST and joint recommendations from CISA, NIST, and the NSA frame preparation as an inventory and migration-planning effort. Organizations can begin with these steps:
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- Inventory cryptography. Identify the systems, applications, data, and assets that rely on cryptographic protections, including where encryption and digital signatures are used.
- Prioritize sensitive information and critical systems. Consider how damaging disclosure would be and how long the information must remain confidential. Include high-value assets and systems whose disruption or compromise would have serious consequences.
- Build a migration roadmap. Plan how systems will move to the finalized standards, taking dependencies and the organization’s priorities into account.
- Engage technology vendors. Ask when and how products and services will support PQC, and factor those plans into the roadmap.
Migration takes coordination across systems and suppliers; waiting for a precise quantum-computer arrival date is not a sound substitute for preparation. NIST mathematician Dustin Moody has urged organizations to begin transitioning to the standards to help protect data in the quantum era. NSA Cybersecurity Director Rob Joyce has similarly said the key is to start the journey now rather than wait until the last minute.
What individuals can do now
- Keep devices, operating systems, and software updated as their vendors release updates.
- When choosing a product or service, ask the provider whether it supports PQC and how it plans to adopt the standards.
- Do not assume a particular phone, browser, messaging service, or other product supports PQC unless its provider confirms that support.
Buying quantum-computing hardware is not a personal cybersecurity precaution. The practical steps for individuals are to maintain updated systems and ask providers about their transition plans.
U.S. federal deadlines are not universal deadlines
A June 2026 U.S. executive order directs federal agencies, within the order’s stated scope and excluding National Security Systems from the specified provision, to transition high-value assets and high-impact systems to PQC for key establishment by December 31, 2030, and for digital signatures by December 31, 2031. It also calls for agencies to develop migration plans.
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Those dates are federal milestones under that order. They do not automatically set deadlines for every private organization or for other countries.
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