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A key package half carries its own signing key, which is the key used in the group that half joins; one key per principal and a fresh key per half both conform. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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The book described the principal as "a credential-scoped signing identity" and the invitation as holding "the signing identity". That reads as one principal-wide signing key, which is only one conforming choice.
This PR clarifies the spec. The principal is a credential-scoped identity that mints key packages and invitations. Each key-package half carries its own signing key, and that's the key its owner signs with in the group the half joins (Group Rules rule 4). One key per principal, as the deployed engine uses, and a fresh key per half both conform. The invitation holds the credential plus the key package's private material, including its signing keys.
Updated in Concepts (the principal, the invitation and the naming table), the Introduction, and the invitation line in Session Lifecycle. This is a clarification, not a shipped anomaly. The API reference is left as is, since it describes the crate's API.
Book-only, with an empty changeset.
mdbook buildpasses.🤖 Generated with Claude Code