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Start planning a post-quantum cryptography (PQC) migration now. First find where your organization uses cryptography, then prioritize data that must remain confidential for years and systems that will be difficult to change. NIST’s three PQC standards finalized in 2024 provide a basis for implementation planning; no one knows when a quantum computer capable of breaking today’s public-key cryptography will be built.
What is harvest now, decrypt later?
Harvest now, decrypt later describes an adversary collecting encrypted information today in the hope of decrypting it later, if a sufficiently capable quantum computer becomes available. The collection can happen before that computer exists, so the risk is already relevant for information whose confidentiality must last a long time.
The concern is not that every encrypted message can be read today. It is that data captured now may still be valuable when future decryption becomes possible. Information with a short useful life is generally a different priority from records, secrets, or communications that must remain confidential for many years.
Do I need to worry about quantum computers breaking encryption?
Organizations that rely on public-key cryptography should plan for the possibility, but should not treat a predicted arrival date as fact. NIST says estimates vary and no one knows how long it will take to build a cryptographically relevant quantum computer. Planning should therefore be driven by the confidentiality lifetime of data and the time needed to migrate systems, not by a forecast.
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NIST notes that integrating a newly standardized algorithm into information systems has historically taken 10 to 20 years. NIST does not state a publication year for that figure on the cited explainer page, so it is best understood as historical context, not a guaranteed migration duration for any particular organization.
Which NIST post-quantum standards should we plan for?
On August 13, 2024, NIST announced approval of its first three finalized PQC standards. Two cover digital signatures; the other covers key establishment. The standards are ready to inform implementation planning, but organizations still need to validate how they fit their own applications, protocols, and counterparties.
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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. |
These standards are a starting point for planning, not a direction to replace every cryptographic component at once. Determine which systems use affected cryptography and coordinate implementation with application owners, technology providers, and the organizations your systems communicate with.
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Begin with visibility and risk assessment. NIST’s migration work describes cryptographic visibility and risk management as core workstreams, and federal guidance from CISA, NSA, and NIST supports early inventories, roadmaps, and vendor engagement.
- Discover cryptographic use. Build an inventory across applications, systems, data flows, protocols, libraries, certificates, keys, and hardware dependencies. Record the algorithms in use, where they are used, who owns each system, and which dependencies or counterparties could affect a change.
- Prioritize by data lifetime and impact. Identify sensitive or high-value information that must remain confidential for a long period. Also flag systems whose failure would have high business or operational impact, especially where dependencies make changes difficult.
- Build a sequenced roadmap. Map application owners, dependencies, testing needs, interoperability requirements, and modernization plans. Sequence work so that high-priority risks and difficult dependencies are addressed deliberately rather than left until a deadline approaches.
- Ask vendors and service providers for plans. Ask what PQC support they intend to provide, how it will be implemented, and how they will handle interoperability. Use the answers in procurement and technology-modernization decisions.
- Validate before broad deployment. Track standards and implementation guidance, then test interoperability and performance in the environment where the systems will operate. NIST’s migration work includes interoperability and benchmarking.
How should we compare migration priorities?
Use the same risk questions across candidate systems so that teams can explain why one migration should come before another. This framework helps organize discovery and sequencing; it is not a product rating or a fixed scoring model.
| Planning dimension | Questions to answer | Why it matters |
|---|---|---|
| Inventory coverage | Do you know which algorithms, protocols, libraries, certificates, keys, and hardware are involved, and who owns them? | Unknown dependencies can delay or block a migration. |
| Data sensitivity and secrecy lifetime | How sensitive is the information, and how long must it remain confidential? | Long-lived sensitive data is more exposed to harvest-now-decrypt-later risk. |
| Business or system impact | What is the consequence of disruption, delay, or an incompatible change? | High-impact systems may merit earlier planning and more careful sequencing. |
| Interoperability | Which counterparties, protocols, or connected services must continue to work? | A change can fail operationally if the other side is not ready or compatible. |
| Vendor readiness | What support and implementation plans have providers communicated? | External dependencies can constrain when and how a system can change. |
| Implementation and testing dependencies | What engineering work, testing, approvals, and sequencing are required? | Migration lead time depends on the system and its environment, not just the algorithm. |
When do we need to migrate?
Start planning now; set implementation timing according to risk, dependency readiness, and the lead time required to test and deploy changes. Do not wait for a precise quantum-computer arrival date, because none is known.
Rank #4
NIST’s project page describes an initial public draft of IR 8547 that proposes deprecation and removal of quantum-vulnerable algorithms from NIST standards by 2035, with high-risk systems transitioning earlier. That is a proposed transition timeline for NIST standards, not a blanket 2035 deadline for every company. Organizations should distinguish applicable federal requirements from general planning guidance and check the status of the draft before relying on it as a current compliance milestone.
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