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Add BE/BS steps to authData generation #2141

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Sep 11, 2024
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Add BE/BS steps to authData generation #2141

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ad88a31
add BE/BS steps to authData
timcappalli Sep 6, 2024
823ce16
s/MUST not/MUST NOT
timcappalli Sep 6, 2024
caf217a
Update index.bs
timcappalli Sep 11, 2024
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8 changes: 8 additions & 0 deletions index.bs
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Expand Up @@ -4758,6 +4758,14 @@ the requested [=public key credential|credential=] is [=scoped=] to exactly matc
possibly combined in a single [=authorization gesture=],
then the authenticator will set both the [=UP=] [=flag=] and the [=authData/flags/UV=] [=flag=].

- The [=BE=] [=flag=] SHALL be set if and only if the credential is a [=multi-device credential=].
This value MUST NOT change after a [=registration ceremony=] as defined in [[#sctn-credential-backup]].

- The [=BS=] [=flag=] SHALL be set if and only if the credential is a [=multi-device credential=] and is currently [=backed up=].

If the backup status of a credential is uncertain or the authenticator suspects a problem with the backed up credential,
the [=BS=] [=flag=] SHOULD NOT be set.

- For [=attestation signatures=], the authenticator MUST set the [=AT=] [=flag=] and include the <code>[=attestedCredentialData=]</code>.
For [=assertion signatures=], the [=AT=] [=flag=] MUST NOT be set and the <code>[=attestedCredentialData=]</code> MUST NOT be included.

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