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If a critical medical device cannot support post-quantum cryptography (PQC), don’t assume that a routine patch—or an unapproved retrofit—will solve the problem. First establish which cryptographic functions the device and its connected services actually use, then obtain the manufacturer’s supported position and assess the clinical and cybersecurity risks together. NIST has finalized PQC standards, but the available guidance does not identify particular medical-device models that cannot transition, set a universal medical-device PQC deadline, or establish a universal retrofit.
What it means when a medical device cannot support PQC
PQC refers to cryptographic algorithms designed to resist attacks from future cryptographically relevant quantum computers. NIST says three finalized PQC standards are ready for implementation. That does not mean every installed device can adopt them: a device’s cryptography may be embedded in hardware, firmware, software, network protocols, certificates, update mechanisms, or vendor-managed services.
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“Unable to support PQC” should therefore be treated as a device- and function-specific finding, not a label inferred from age, vendor silence, or the presence of a vulnerable algorithm somewhere in the surrounding network. A device may use public-key cryptography for one function but not another; a gateway or service may also be the actual point where an algorithm needs to change. Establishing where cryptography is used is the first step toward knowing whether the device itself needs an update, whether a connected component can address the dependency, or whether no supported path exists.
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Is there a medical-device PQC deadline or mandate?
The sources available for this topic do not establish a medical-device-specific PQC deadline or a requirement to replace every device that lacks a PQC implementation. NIST IR 8547, Transition to Post-Quantum Cryptography Standards, was published as an initial public draft on November 12, 2024; its public-comment period closed January 10, 2025. It is a draft transition document, not a final device-specific rule.
FDA’s final February 2026 guidance, Cybersecurity in Medical Devices: Quality Management System Considerations and Content of Premarket Submissions, addresses cybersecurity design, labeling, and premarket-submission documentation for devices with cybersecurity risk, including recommendations related to section 524B cyber devices. It superseded the June 27, 2025 final guidance. The reviewed FDA guidance does not set out a PQC-specific deadline for installed medical devices. This distinction matters: general medical-device cybersecurity guidance and PQC transition recommendations are not, by themselves, a device-specific instruction to retrofit or replace a particular model.
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What to inventory before deciding what to do
NIST’s migration project frames PQC readiness as discovering the use of quantum-vulnerable public-key algorithms across hardware, software, and services, then prioritizing where standardized algorithms should be implemented. Its FAQ describes inventory information such as algorithms, protocols and services, key metadata, certificates, dependent systems, and protected data. Record dependencies and metadata; do not collect secret key material as part of an inventory.
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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →For a clinical environment, map the device in context rather than treating its asset record as the whole story. Include relevant connected components and supplier-operated services so the organization can see where cryptographic functions are performed and what could be affected by a change.
- Device and compute: medical device, embedded hardware, firmware, operating software, cryptographic libraries, and any local management interface.
- Connections: network protocols, authentication, key establishment, certificates, gateways, servers, applications, and systems that depend on the device’s data.
- Trust and updates: secure boot, code signing, software or firmware updates, remote servicing, and the vendor services that issue or validate credentials.
- Protected information: the data involved, the systems or services protecting it, and the period for which confidentiality is needed.
- Operational context: clinical criticality, network exposure, device service life, dependency chains, and the availability of manufacturer support.
NIST’s FAQ puts the sequencing plainly: “organizations cannot effectively prioritize or migrate cryptography they have not identified.” The practical implication is to inventory first, then decide which systems and functions need attention rather than treating every device as an identical migration case.
How to assess and manage a device with no known PQC path
- Discover the cryptographic use. Build the device-and-dependency inventory. Identify algorithms and protocols, the functions that rely on them, and whether those functions reside in the device, a gateway, another system, or a vendor service.
- Prioritize the exposure. Rank the situation using clinical service criticality, network exposure, the sensitivity and required confidentiality lifetime of protected data, expected device service life, dependency chains, and vendor support. These are practical risk factors, not a NIST- or FDA-prescribed scoring formula.
- Get a model-specific manufacturer position. Ask which public-key algorithms and protocols the device uses; which functions are implemented in hardware versus firmware or software; and whether secure boot, code signing, authentication, key establishment, remote servicing, or update channels depend on vulnerable algorithms. Ask whether a PQC-capable update is planned and supported for this model and installed base, what validation or downtime a change would require, and what service-life and end-of-support commitments apply.
- Evaluate a supported change before deployment. If an update or architectural change is proposed, ask the manufacturer what it changes and what device-specific validation supports it. Check interoperability and performance in a controlled, non-production environment, and route the change through cybersecurity, clinical engineering, patient-safety, and organizational change-control processes. NIST describes controlled interoperability testing as part of migration work. CISA’s 2024 operational-technology material is adjacent context—not medical-device-specific evidence—that some operational systems need extensive safety testing after software updates.
- Choose mitigations or a replacement plan if no supported update exists. Document the actual exposure, dependencies, proposed controls, and accountable security, clinical, procurement, and safety owners. Compare continued use with compensating controls, isolation or segmentation, service replacement, and planned device replacement. Do not treat an unvalidated retrofit as an established safe solution.
How to compare the available options
The right response depends on whether an option changes the vulnerable cryptographic function or only limits exposure to it. Use the following comparison questions with the device’s manufacturer and the organization’s clinical and security owners; they are decision factors, not a prescribed scoring rubric.
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| Option | What it may address | What must be established |
|---|---|---|
| Manufacturer-supported PQC update or redesign | May change the vulnerable cryptographic function itself. | Manufacturer support for the exact model and installed base, device-specific validation, interoperability, and the effect on clinical availability and safety. |
| Compensating controls, including segmentation or isolation | May reduce exposure to a vulnerable function without replacing its cryptography. | Evidence that the control works in the installed configuration, effects on required clinical connections, and whether the remaining exposure is acceptable for the data and device service life. |
| Service or architecture replacement | May move a cryptographic dependency to a supported component or service; it may not remove dependencies inside the device. | Which component performs the function, supplier support, interoperability with attached systems, and operational and clinical consequences. |
| Planned device replacement | May replace a device for which no acceptable supported path exists. | Clinical suitability, transition and availability planning, migration of dependent systems, and the manufacturer’s support and validation position for the replacement. |
For each option, weigh the degree to which it addresses the vulnerable function, manufacturer support and device-specific validation, clinical availability and safety, interoperability, data-confidentiality lifetime, device service life, implementation and operating cost, and evidence that the control works in the installed configuration. No source reviewed establishes that one option is universally appropriate or that every non-PQC device should be replaced.
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Cryptographic agility means being able to change cryptographic algorithms without breaking the systems and services that depend on them. NIST’s crypto-agility work spans protocols, applications, software, hardware, firmware, and infrastructure; changing an algorithm while preserving operations can be challenging. In a medical-device environment, a change to one component can affect interoperability, authentication, servicing, update validation, or dependent systems. That is why an organization should not infer that a software patch is sufficient—or safe—without a supported, device-specific change path.
NIST mathematician Dustin Moody, who heads the PQC standardization project, said: “We encourage organizations to begin their transition to these standards immediately to ensure their data remains secure in the quantum era.” For healthcare organizations, beginning now means finding and prioritizing cryptographic dependencies and establishing vendor-supported paths; it does not mean making unvalidated changes to devices in clinical use.
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What healthcare organizations can do now
- Assign joint ownership across cybersecurity, clinical engineering or biomedical teams, clinical operations, procurement, and patient safety.
- Start a cryptographic inventory that includes devices, connected systems, protocols, certificates, update and signing mechanisms, and vendor services.
- Request model-specific algorithm, support, service-life, and migration information from manufacturers; track unanswered questions as unresolved dependencies rather than assuming either compatibility or incompatibility.
- Prioritize systems using clinical impact, exposure, data confidentiality lifetime, dependency risk, service life, and available support.
- Use controlled interoperability and performance testing for proposed changes, with clinical change control before production deployment.
- For devices without a supported path, document the risk decision, compensating controls, responsible owners, and any planned service or device replacement.
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