Post-Quantum Readiness Needs Two Migration Plans

AthelGuard Editorial · Latest Insights

A supplier says its product is “post-quantum ready.” Before treating that as a purchasing advantage, ask which job the new cryptography performs: establishing keys for confidential communication, or signing information so another system can check its authenticity.

NIST finalized IR 8547, Transition to Post-Quantum Cryptography Standards, on October 27, 2026. The report addresses both key establishment and digital signatures. NIST’s announcement also emphasizes the cryptographic supply chain and the risk of collecting encrypted information now to decrypt later. These are reasons to plan a transition around actual uses, rather than one product-wide readiness label.

Separate the Two Jobs

For a service holding long-lived confidential information, the first question is where vulnerable key establishment is still used. For a connected product, a different question may dominate: can its installed devices verify a future signed update? A successful connection demonstration does not answer the update question.

Ask for a Compatibility Boundary

Our practical assessment approach is to request a small matrix: the cryptographic function, component version, counterpart it must work with, supported configuration and remaining dependency. This reveals whether “ready” means a library supports an algorithm, a feature is enabled, or an entire customer workflow has been exercised.

Choose a representative workflow and test the transition at its boundaries. For a protected connection, check what is actually negotiated and what happens with an older endpoint. For signed updates, check the signing path and the devices that must accept the result. Include failure behavior: silent fallback can make a demonstration look successful while changing the protection it provides.

Record resource and compatibility costs under the intended workload. A passing demonstration on a development machine does not establish performance on a constrained device or across the installed fleet. Agree on acceptable behavior before choosing the deployment path.

Turn Readiness Into a Decision

A useful conclusion names the workflow that can migrate, the dependencies still unresolved and the evidence needed for the next step. It should distinguish work the supplier controls from work that depends on customers or other vendors. That is more actionable than a single readiness percentage.

NIST’s publication is a current planning reference, not proof that a particular supplier has completed migration. This article is AthelGuard’s editorial interpretation, not a product test, certification or universal compliance deadline. Independent Technical Assessments help connect technology claims to the decision a business needs to make.