implementing-identity-verification-for-zero-trust

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

Prerequisites

• Familiarity with zero trust architecture concepts and tools
• Access to a test or lab environment for safe execution
• Python 3.8+ with required dependencies installed
• Appropriate authorization for any testing activities

Architecture

Identity Verification Flow

User Access Request
    │
    v
┌───────────────────────┐
│ Primary Authentication │
│ - FIDO2/WebAuthn key  │
│ - Certificate-based    │
│ - Passwordless         │
└──────────┬────────────┘
           v
┌───────────────────────┐
│ Contextual Assessment  │
│ - Device posture       │
│ - Network location     │
│ - Geo-velocity check   │
│ - Time of access       │
│ - Behavioral baseline  │
└──────────┬────────────┘
           v
┌───────────────────────┐
│ Risk Scoring Engine    │
│ - Aggregate signals    │
│ - Calculate risk score │
│ - Compare to threshold │
└───┬──────────┬────────┘
    │          │
 Low Risk   High Risk
    │          │
    v          v
┌────────┐  ┌──────────────┐
│ Grant  │  │ Step-up Auth  │
│ Access │  │ - Hardware key│
│        │  │ - Biometric   │
│        │  │ - Manager OK  │
└────────┘  └──────────────┘

Identity Provider Architecture

1. Primary IdP: Azure AD / Okta / Ping Identity for centralized identity management
2. FIDO2 Authenticators: Hardware security keys (YubiKey) or platform authenticators (Windows Hello, Touch ID)