I don’t get it. Were there revisions or optional features of v1.2?

I thought the 1.2 spec was the frozen spec.

TLS is an extensible protocol. For instance, you can add new key establishment algorithms or cipher suites. What this specification is saying is that the IETF will not be publishing such extensions for TLS 1.2. For example, they will not be adding post-quantum key establishment.

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