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This Specification sets forth the Kantara Initiative International Assurance Program (KIIAP) Service Assessment Criteria for assessments against the organizational requirements applicable across the NIST Special Publication 800-63 Revision 4 criteria suite, published in August 2025, and shall be generally referred to as the '63-4 Base Volume'.
The 63-4 Base Volume establishes the common organizational requirements applicable to all services assessed under the SP 800-63 Revision 4 certification framework and is used in conjunction with the 63A-4_SAC, 63B-4_SAC, and 63C-4_SAC.
The current version of the 63-4 Base Volume is v1.0, released June 2026.

