SENTINEL presents a universal, framework-agnostic methodology for evaluating zero-trust architecture completeness using binary checkpoint evaluation. Unlike vendor-specific maturity models that produce subjective scores, SENTINEL provides objective PASS/FAIL assessment against mathematically derived requirements. The N-Function Completeness Theorem proves that any zero-trust architecture requires at least 12 functionally distinct security capabilities (N ≥ 12), at least 3 trust boundary zones (M ≥ 3), and at least 4 evaluation criteria per capability (K ≥ 4). This enhanced edition includes comprehensive threat taxonomy definitions (T1-T8) with functional independence proofs, concrete checkpoint evaluation examples demonstrating PASS/FAIL scenarios, and detailed regulatory compliance matrices covering DORA, CMMC Level 3, ISO 27001, PCI DSS, and NIST 800-207. SENTINEL maps to existing frameworks including NIST SP 800-207, CISA Zero Trust Maturity Model, DoD Zero Trust Reference Architecture, and DORA requirements. Y.I.N. FORTRESS serves as the reference implementation demonstrating 100% SENTINEL compliance with validated performance: 640× timing attack resistance, 135× invalid detection speedup, and 1.5pp accuracy degradation. Patent Protected: 20+ USPTO Applications | 650+ Claims | Core Patents: 63/943,413 , 63/962,736
Mazari et al. (Tue,) studied this question.