Re: [webauthn] Proposal: Scoped Attestation Privacy + Practical CBOR Size Guidance (WebAuthn L3) (#2390)

Follow-up (clarification)

- The proposal is fully backward-compatible and introduces no new cryptographic primitives; it only makes explicit the scoped-privacy expectation for attestation material.
- The size numbers (8KB / 6KB / 10KB) are intentionally NON-normative guidance (“aim to keep”), meant to reduce deployability/transport failure modes. If preferred, the WG can keep only “SHOULD minimize” in the main text and move the numeric values to an informative note.
- The referenced WPT-style tests are WARN-only diagnostics (not conformance failures) and are provided purely to demonstrate testability and help detect cross-RP correlation risk indicators early.

Happy to adjust wording to match WG preference (e.g., “MUST NOT enable cross-RP correlation unless user explicitly consents” vs. softer informative phrasing).


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Received on Saturday, 7 February 2026 19:16:33 UTC