Quantum computers are not currently breaking the encryption organizations use. The long-term concern is that a sufficiently capable quantum computer could undermine important forms of public-key cryptography, putting some key-establishment and digital-signature systems at risk. Organizations should prepare now: find where cryptography is used, prioritize data that must stay secret for years, and plan a controlled migration to finalized post-quantum cryptography standards.
What quantum computing could put at risk
Quantum computers use qubits and quantum effects to perform some calculations differently from conventional computers. If a cryptographically relevant quantum computer becomes available, it could threaten public-key cryptography that depends on mathematical problems vulnerable to quantum methods. Public-key cryptography is used for tasks such as establishing keys and creating or verifying digital signatures; the implications reach systems, protocols and services that rely on those functions.
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This is a future capability risk, not evidence that current operational encryption has been defeated. Nor does it mean every form of encryption is affected in the same way. The risk discussed here is especially significant for vulnerable public-key algorithms, so organizations need to identify which cryptographic functions and dependencies they actually use. NIST explains the quantum threat and its limits.
Why organizations need to act before a quantum computer exists
Encrypted data can be collected now and targeted later
“Harvest now, decrypt later” describes an adversary collecting encrypted information today in the hope of decrypting it when quantum capability becomes available. That creates a present-day concern for information that must remain confidential for a long time: a future breakthrough could expose data that was intercepted years earlier. Organizations should consider not just how sensitive a record is now, but how long it must remain secret.
There is no dependable arrival date
NIST says nobody knows how long it will take to build a cryptographically relevant quantum computer, and predictions vary. Its explainer, updated February 27, 2026, notes that some people think one could be possible in less than 10 years; this is not a consensus forecast or deadline. NIST also gives 10 to 20 years as broad historical context for the time it can take to integrate a technology from standardization into information systems—not as a forecast for every organization’s migration. NIST’s current explanation makes the uncertainty explicit.
Preparation is therefore a risk-management decision, not a bet on a particular date. NIST mathematician Dustin Moody, who leads its post-quantum cryptography standardization project, advises: “We encourage organizations to begin their transition to these standards immediately to ensure their data remains secure in the quantum era.”
Post-quantum cryptography is not quantum cryptography
Post-quantum cryptography (PQC) uses mathematical algorithms designed to resist attacks from both conventional and quantum computers. It is intended to run on conventional computing systems. Quantum cryptography is a different idea: it uses quantum physics to create cryptographic techniques. These terms are not interchangeable, and adopting PQC does not mean an organization needs a quantum computer. NIST distinguishes the two approaches.
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NIST has finalized three PQC standards that are ready to implement. Among them, ML-KEM supports key establishment and ML-DSA supports digital signatures. An organization still needs to determine which standards and implementations fit each use, and how they work across its systems; adopting one algorithm is not a complete migration. Consult NIST’s post-quantum cryptography page for current standards status and implementation information.
What organizations should do now
1. Assign ownership across the organization
Make the migration an accountable program rather than a task left to one security team or a single product purchase. Bring in security, IT, architecture, procurement and supplier management, along with privacy, risk and operational-technology (OT) teams where relevant. Give the team authority to track dependencies, set priorities and coordinate changes that could affect service delivery.
2. Discover and inventory cryptography
Find where public-key cryptography and related dependencies appear across the organization. Include protocols, applications, libraries, certificates and identity systems; hardware, firmware and software updates; cloud and managed services; and OT. Record system owners, suppliers, dependencies and the cryptographic functions in use. A useful inventory is maintained and assigned to owners, not just a one-time list of algorithm names.
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NIST’s Migration to Post-Quantum Cryptography guidance emphasizes cryptographic discovery and inventory as foundations for migration.
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3. Prioritize by the consequences of exposure and replacement
Use the inventory to identify where preparation matters most. Consider data sensitivity and the length of time it must remain confidential, system criticality, external exposure, dependencies, and how difficult the cryptography will be to replace. Give early attention to long-lived sensitive information, high-value systems, externally accessible datasets and systems whose cryptography is deeply embedded or difficult to update. This is more useful than treating every system as equally urgent.
4. Ask vendors for evidence and a usable upgrade path
Ask technology providers and service suppliers which PQC standards and versions they support, what their crypto-agility roadmap is, whether implementations have been tested, how upgrades will work, and what compatibility or performance effects to expect. Request details that let your team evaluate dependencies and plan change windows. A vendor’s statement that a product is “quantum-safe” is not proof that it interoperates with your protocols, devices, certificates or other suppliers.
5. Plan staged adoption and test before production
Map each prioritized use to the relevant finalized standard and to the systems that depend on it. Build a staged migration plan, then validate implementations and interoperability in controlled environments before changing production systems. Test the connected pieces—not just an algorithm in isolation—including dependent protocols, certificates, devices and service providers. The goal is to find operational problems early while preserving security and service continuity. NIST’s migration guidance addresses discovery, prioritization and implementation planning.
6. Build crypto agility into the plan
Crypto agility is the ability to replace or adapt cryptographic algorithms across protocols, applications, software, hardware, firmware and infrastructure while maintaining security and ongoing operations. NIST describes it as “the capabilities needed to replace and adapt cryptographic algorithms in protocols, applications, software, hardware, firmware, and infrastructures while preserving security and ongoing operations.” That capability can make future changes less disruptive, but it depends on understanding system dependencies and testing updates. NIST’s crypto-agility announcement was published December 19, 2025.
7. Track applicable requirements separately
Keep regulatory, sector-specific and government requirements distinct from general readiness advice. Federal requirements and migration schedules do not necessarily apply in the same way to every private organization or geography. Determine which obligations govern your organization and plan to meet them alongside technical priorities. The joint CISA, NSA and NIST quantum-readiness fact sheet recommends a roadmap that includes inventory, risk assessment, prioritization and vendor engagement.
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How to judge whether a migration plan is ready
A plan should connect cryptographic discovery to operational decisions. Before approving production changes, check that the organization can answer these questions:
- Which systems use vulnerable public-key functions for key establishment or digital signatures, and who owns them?
- Which information has a secrecy lifetime that extends far enough to make harvest-now-decrypt-later a concern?
- Which systems are critical, externally exposed, difficult to update, or dependent on multiple vendors?
- Which finalized standards and supported implementations apply to each use, and what does each supplier actually support?
- Have interoperability and operational effects been tested across dependent protocols, certificates, devices and services?
- Can cryptographic components be replaced or adapted without unacceptable disruption?
NIST’s implementation status and migration guidance are available through its PQC standards page and migration project. They provide a basis for planning around standards that exist now rather than waiting for a quantum-computing milestone whose timing is unknown.
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