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Post-quantum cryptography (PQC) is cryptography designed to resist attacks from both classical and quantum computers. Its algorithms run on existing computing platforms; organizations do not need quantum computers to use them. The reason to plan a migration now is practical: updating cryptography across systems and suppliers takes time, while encrypted data collected today could be targeted for decryption in the future.
What post-quantum cryptography does
PQC uses mathematical algorithms intended to withstand attacks from powerful quantum computers as well as conventional computers. It addresses a future risk to some widely used cryptographic systems; it does not mean that all encryption is already broken or that quantum computing defeats every cryptographic method equally.
PQC is different from quantum key distribution (QKD). PQC relies on mathematical algorithms implemented in software and existing computing platforms. QKD uses quantum-mechanical systems and specialized technology to distribute keys. The terms are not interchangeable. The U.S. National Security Agency (NSA) says it does not recommend QKD or quantum cryptography for National Security Systems unless cited limitations are overcome; that position is specific to those systems, not a universal judgment about every possible use.
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1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsWhy begin migrating before a quantum computer can break current encryption?
Some data may need to stay secret for years
In a “harvest now, decrypt later” attack, an adversary collects and stores encrypted information that cannot be read today, hoping to decrypt it if future quantum capabilities make that possible. This makes the issue relevant now for information whose confidentiality must last a long time. It does not establish that a particular adversary is collecting any particular organization’s data.
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Cryptographic change takes time
NIST says it has historically taken 10 to 20 years from standardization of a new algorithm to its full integration into information systems. That is a historical estimate, not a prediction that every PQC deployment will take that long. A migration can involve applications, products, services, protocols, and supplier-controlled dependencies—not just a single setting an organization can switch.
The timing of the quantum threat is uncertain
NIST says estimates vary widely and it is not possible to predict exactly when—or even whether—quantum computers will break present-day encryption. A credible migration plan therefore does not need a speculative “Q-Day” countdown. It can be justified by the long lead time, the sensitivity and secrecy lifetime of data, and the effort required to find and update cryptographic dependencies.
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Which PQC standards are ready to implement?
NIST released its first three final PQC standards in August 2024. They cover different cryptographic functions, so they are not interchangeable versions of one general-purpose encryption algorithm.
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| Standard | Algorithm | Function |
|---|---|---|
| FIPS 203 | ML-KEM (Module-Lattice-Based Key-Encapsulation Mechanism) | Key establishment |
| FIPS 204 | ML-DSA (Module-Lattice-Based Digital Signature Algorithm) | Digital signatures |
| FIPS 205 | SLH-DSA (Stateless Hash-Based Digital Signature Algorithm) | Stateless hash-based digital signatures |
NIST says organizations can implement these standards now and encourages them to begin applying them. NIST is also evaluating additional algorithms that could become backup or alternative standards. Which standard is relevant depends on the cryptographic function a system needs; selecting and deploying algorithms should be part of an organization’s technical migration planning.
What migration timelines apply—and to whom?
NIST’s transition timeline, described in NIST IR 8547, calls for quantum-vulnerable algorithms to be deprecated and ultimately removed from NIST standards by 2035, with high-risk systems transitioning earlier. This is a NIST standards transition timeline, not a universal legal deadline for every organization.
A June 2026 U.S. executive order sets directions for federal high-value assets and high-impact systems, excluding National Security Systems: transition to PQC for key establishment by December 31, 2030, and for digital signatures by December 31, 2031. Those dates have a defined federal scope. They should not be treated as deadlines for every company, country, or National Security System.
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Separately, a joint CISA, NIST, and NSA release dated August 21, 2023 recommended that organizations prepare by building roadmaps, engaging technology vendors, taking inventory, and prioritizing sensitive and critical assets. The recommendation predates the August 2024 final standards; it is preparation guidance, not a substitute for the standards themselves.
How an organization can start
Start with discovery and risk prioritization rather than assuming every system should change at once or in the same way. The joint CISA, NIST, and NSA guidance supports establishing a roadmap, engaging vendors, inventorying cryptographic systems and assets, and planning prioritized migrations.
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- Inventory cryptographic use. Identify applications, systems, protocols, and assets that rely on cryptography, including where public-key cryptography is used. NIST advises technology managers to inventory applications that use encryption and alert technology teams and vendors.
- Prioritize by exposure and impact. Determine which data must remain confidential for the longest period, which systems are most critical, and which assets are sensitive. The joint guidance specifically recommends prioritizing sensitive and critical assets.
- Ask suppliers about their plans. Find out which products, services, and protocols contain cryptographic dependencies, how vendors plan to update them, and what the organization must do to adopt those updates. Some dependencies may be controlled outside the organization.
- Build a migration roadmap. Use the inventory and priorities to plan replacements or updates, coordinate affected teams and suppliers, and sequence work. NIST notes that cybersecurity products, services, and protocols will need updates as organizations move to PQC.
This is a starting framework, not a complete technical implementation guide. The right migration sequence depends on an organization’s systems, data, and supplier dependencies.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What PQC migration does not mean
- It does not require quantum hardware. PQC algorithms are designed to run on existing computing platforms.
- It does not mean all current encryption has failed. The concern is that future quantum capability could threaten some widely used cryptographic systems, which is why organizations need to identify vulnerable uses and plan updates.
- It does not make QKD another name for PQC. PQC is based on mathematical algorithms; QKD relies on quantum-mechanical systems and specialized technology.
- It does not establish one universal deadline. NIST’s standards timeline and the federal executive order have specific scopes; neither should be generalized into a global requirement for every organization.
The practical takeaway
Organizations do not need to predict when a cryptographically relevant quantum computer will arrive to justify preparation. They can begin by discovering where cryptography is used, identifying data and systems that deserve priority, and coordinating with suppliers on a standards-based migration roadmap. The goal is an orderly transition before vulnerable dependencies become an urgent operational problem.
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