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Please see Unisys Report here: RQuint-Unisys Kantara Service Assessment Criteria - KBV impasse for IAL2.docx
Reference NIST 63A (original text): NIST.SP.800-63a.pdf
Section 4.4
Table 5.3. Use of KBV at
Set of special requirements 5.3.2
He did not find reference to this on KI criteria
Update on Identity Proofing and Verification Use Cases Discussion Group
Link about IDVP use cases: https://kantarainitiative.org/groups/idpvusecases/section 4.4