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Changing a protocol to post-quantum

The decisions​

Which job is changing, which option an authority defends, and how you roll back.

Reading order​

  1. Choosing an option
  2. Key establishment
  3. Signatures
  4. Changing algorithms again
  5. Vendor plan

Outcome​

Which job is changing, which option an authority defends, and a way to roll back.

A weak answer​

"We enabled PQC."

A stronger answer​

"We changed key establishment on one channel, the EU roadmap is the authority we are following for that high-risk system, and the rollback steps were written before the pilot."

The EU NIS Cooperation Group roadmap, 11 June 2025, is the authority named in that answer for a high-risk system. Vista Security, a vendor blog of 13 October 2026, is a sizing of writing the rollback before a pilot. It is not an authority, and this page does not copy a plan from that blog.

Sources​

  • EU NIS Cooperation Group, Coordinated Implementation Roadmap, version 1.1, 11 June 2025. Roadmap
  • Vista Security, a vendor blog, 13 October 2026. Vendor blog