[w3c/webauthn] 57d370: Adding a choice for RP to express preferences for ...

  Branch: refs/heads/balfanz-patch-4
  Home:   https://github.com/w3c/webauthn
  Commit: 57d370bcd21d9cabeead298b135921ff7584b2f3
      https://github.com/w3c/webauthn/commit/57d370bcd21d9cabeead298b135921ff7584b2f3
  Author: balfanz <dirk@balfanz.net>
  Date:   2017-10-11 (Wed, 11 Oct 2017)

  Changed paths:
    M index.bs

  Log Message:
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  Adding a choice for RP to express preferences for attestation types

Adding a choice for RP to express preferences for attestation types. "low-cost" means don't bother the user to get the attestation, don't do a network roundtrip, etc., even if that means that we won't end up with a meaningful attestation (i.e., even if we only get self-attestation). "verifiable" means that the RP wants a verifiable attestation, even if that means that the user agent needs to connect to the Privacy CA, collect user consent, wait for ECDAA signatures to finish, etc.