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The post-quantum migration plan

The decisions​

What has to move, what is first, and what the one-page plan says.

Reading order​

  1. Where to start
  2. Inventory
  3. Priority
  4. Dates
  5. The next pass
  6. Inventory questions
  7. Prioritisation checklist

The CISA, NSA, and NIST fact sheet, as of 17 August 2023, is the short official start: inventory, vendors, and supply chain. The UK NCSC timelines, modified 3 August 2026, are the clock to name on the plan if that is the clock you are following.

Outcome​

An inventory, a priority, and a one-page plan.

A weak answer​

"We have a PQC programme."

A stronger answer​

"The inventory names the long-secrecy systems, the priority says why they are first, and the plan has a next review date."

Sources​

  • CISA, NSA, and NIST, Quantum-Readiness fact sheet, as of 17 August 2023. Fact sheet
  • UK NCSC, Timelines for migration to post-quantum cryptography, modified 3 August 2026. Timelines