| name | implementing-identity-verification-for-zero-trust |
| description | Implement continuous identity verification for zero trust using phishing-resistant MFA (FIDO2/WebAuthn), risk-based conditional access, and identity governance aligned with the CISA Zero Trust Maturity Model. |
| domain | cybersecurity |
| subdomain | zero-trust-architecture |
| tags | ["zero-trust","identity","authentication","mfa","identity-verification"] |
| version | 1.0 |
| author | mahipal |
| license | Apache-2.0 |
| atlas_techniques | ["AML.T0052"] |
| nist_ai_rmf | ["GOVERN-1.1","GOVERN-1.7","MAP-1.1"] |
| nist_csf | ["PR.AA-01","PR.AA-05","PR.IR-01","GV.PO-01"] |
Implementing Identity Verification for Zero Trust
Prerequisites
- Understanding of zero trust principles (NIST SP 800-207)
- Familiarity with identity providers (Azure AD, Okta, Ping Identity)
- Knowledge of authentication protocols (SAML 2.0, OIDC, FIDO2)
- Understanding of MFA and passwordless authentication
Overview
Identity is the foundational pillar of zero trust architecture. NIST SP 800-207 mandates that all resource authentication and authorization are dynamic and strictly enforced before access is allowed. Identity verification in zero trust goes beyond traditional username/password by implementing continuous, risk-adaptive authentication using multiple signals including device posture, behavioral biometrics, location, and network context.
This skill covers implementing phishing-resistant MFA, continuous identity verification, risk-based conditional access, and identity governance aligned with the CISA Zero Trust Maturity Model Identity Pillar.
When to Use
- When deploying or configuring implementing identity verification for zero trust capabilities in your environment
- When establishing security controls aligned to compliance requirements
- When building or improving security architecture for this domain
- When conducting security assessments that require this implementation
Common Misconfigurations & Verification
Identity zero trust silently degrades when verification happens once at login and never again. Look for these:
- Authenticated once, never re-evaluated. No Continuous Access Evaluation (CAE) means a disabled or risky user keeps a valid token for the full session lifetime - revocation should land within minutes of a critical event, not hours.
- Legacy auth still open. IMAP/POP3/SMTP basic-auth endpoints bypass Conditional Access and MFA entirely; one open legacy protocol neuters phishing-resistant FIDO2 everywhere else.
- Phishable MFA still allowed as fallback. SMS/voice/push left enabled lets attackers downgrade from WebAuthn.
- Break-glass accounts excluded from all policies and never monitored.
- Risk policies in report-only, so high-risk sign-ins are logged but allowed.
How to confirm: disable a test user (or change their password) mid-session and verify their active token is revoked via CAE. Attempt a legacy-auth login (IMAP with an app password) and confirm it is blocked. Trigger a high-risk sign-in and confirm step-up or block actually fires in the sign-in logs - do not trust the policy until you have seen it deny.
Prerequisites
