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1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesStart planning your post-quantum cryptography (PQC) migration now: find where your organization uses cryptography, identify data that must remain confidential for years, and map the systems and vendors that would need to change. NIST’s first three PQC standards were finalized in 2024, but no one knows when a quantum computer capable of breaking today’s vulnerable cryptography will exist. Your plan should be driven by the sensitivity and lifespan of your data and the time needed to migrate—not by a predicted arrival date.
What is harvest now, decrypt later?
Harvest now, decrypt later describes a present-day risk: an adversary collects encrypted data now and stores it in the hope of decrypting it later if a sufficiently capable quantum computer becomes available. The collection can happen before that computer exists.
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The concern is greatest for information that would remain sensitive for a long time. Data that loses its value quickly presents a different level of exposure from records that must stay confidential for many years. The useful planning question is therefore not just “How strong is this encryption today?” but “How long must this information remain secret, and how long would changing the systems that protect it take?”
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Organizations should take the risk seriously, but they should not treat a quantum breakthrough as imminent or assume that all encryption is already broken. NIST says estimates for building a cryptographically relevant quantum computer vary and that no one knows how long it will take. There is no established arrival date to use as a planning deadline.
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Instead, account for the possibility that encrypted data collected today could be exposed later. This matters especially when information has a long confidentiality lifetime and when the systems protecting it are difficult to update. Migration itself can take years: NIST notes that integrating a newly standardized algorithm into information systems has historically taken 10 to 20 years. That is historical context, not a forecast for every organization or a promised migration duration.
Which NIST post-quantum standards should we plan for?
NIST announced approval of three PQC standards on August 13, 2024. They cover two different jobs—establishing shared secrets and creating digital signatures—so they are not interchangeable choices for a single “encryption upgrade.” NIST says the standards are ready to inform implementation planning.
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| Standard | Algorithm | Purpose |
|---|---|---|
| FIPS 203 | ML-KEM | Key-encapsulation mechanism used to establish a shared secret. |
| FIPS 204 | ML-DSA | Digital signatures. |
| FIPS 205 | SLH-DSA | Digital signatures. |
Use the standards as the basis for discussions with system owners and providers, while checking current implementation guidance and testing the versions intended for your environment. A standard’s publication does not, by itself, make every product, protocol, or partner compatible with it.
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What should my organization do first to prepare?
Begin with an inventory and a risk-based roadmap. NIST’s migration work emphasizes cryptographic visibility, risk management, interoperability, and benchmarking; federal guidance from CISA, NSA, and NIST also points organizations toward early inventories, risk assessments, and vendor engagement.
1. Discover where cryptography is used
Build a record of cryptographic use across applications, infrastructure, data flows, protocols, libraries, certificates, keys, and hardware dependencies. Include systems run by third parties as well as those your teams operate. Record the algorithms and components involved, their owners, their business purpose, and the systems or counterparties they depend on. An inventory that covers only central IT may miss embedded or externally managed dependencies that make migration harder.
2. Prioritize by confidentiality lifetime and impact
Identify which information needs long-term confidentiality and which systems would cause serious harm or disruption if their cryptography failed or could not be changed promptly. Give early attention to the overlap: long-lived sensitive data protected by high-impact or difficult-to-update systems. Record why an item is high priority so owners can make sequencing decisions consistently.
3. Build a migration roadmap
Turn the inventory into sequenced work rather than a one-time compliance checklist. For each priority system, identify the accountable owner, dependent applications and services, required changes, testing needs, and a feasible migration order. Account for interoperability with protocols and counterparties: a change that works in one system may still fail if a connected service cannot negotiate or validate the updated cryptography.
4. Ask vendors for specific plans
Ask technology and service providers which PQC standards and implementation approaches they plan to support, how they will handle interoperability, and what dependencies or limitations customers should expect. Capture their answers in procurement and modernization decisions. A general statement that a product is “quantum-ready” is less useful than a clear account of supported standards, affected components, delivery plans, and testing arrangements.
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5. Validate before broad rollout
Test interoperability and performance in the environments and workflows that matter to your organization before scaling a change. Include counterparties and connected services where possible, and track current standards and implementation guidance as they evolve. Record test results, unresolved dependencies, and rollback or recovery procedures as part of the migration plan.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How should we compare migration priorities?
Use the same decision factors across systems so that the roadmap reflects risk and feasibility, not just which upgrade is easiest to schedule.
| Factor | Question to answer | Why it matters |
|---|---|---|
| Inventory coverage | Do we know the cryptographic components, owners, and dependencies involved? | Unknown components can delay a change or leave a system outside the migration plan. |
| Data sensitivity and secrecy lifetime | How sensitive is the protected information, and how long must it remain confidential? | Long-lived sensitive data is more exposed to harvest-now-decrypt-later risk. |
| Business and system impact | What would happen if the system were disrupted or its protections became inadequate? | High-impact systems may need earlier attention and more careful sequencing. |
| Interoperability | Which protocols, services, customers, or counterparties must continue to work with it? | Migration depends on connected systems being able to support compatible changes. |
| Vendor readiness | What support has each provider committed to, and what remains unclear? | External dependencies can constrain timing and procurement choices. |
| Implementation and testing | What engineering, validation, and rollout work is required? | Complex changes need realistic lead time and environment-specific testing. |
This framework is for prioritizing work, not scoring products. Where an answer is unknown, treat that uncertainty as an inventory or vendor-engagement task rather than assuming the dependency is ready.
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Start planning now, then set migration timing from the risk and lead time of each system. The unknown quantum-computer timeline is not a reason to wait: inventories, vendor commitments, interoperability checks, and application changes can all take time, and long-lived sensitive data may remain valuable to an adversary well into the future.
NIST’s project page describes draft IR 8547 as proposing deprecation and removal of quantum-vulnerable algorithms from NIST standards by 2035, with high-risk systems transitioning earlier. This is a draft standards-transition timeline, not a universal legal or operational deadline for every company. Check the draft’s status and applicable requirements before using that date as a planning milestone.
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