In today’s cloud-first, hybrid world, traditional perimeter security is no longer enough. The rise of remote work, mobile devices, and SaaS applications has dissolved the classic network boundary. To protect corporate data wherever it lives, organizations are shifting to a Zero Trust security model — one that assumes no user or device should be trusted by default.

Microsoft’s Intune and Entra ID (formerly Azure Active Directory) provide a powerful foundation for implementing Zero Trust across identities, devices, and applications.

What Is Zero Trust?

Zero Trust is a security framework based on a simple principle:

“Never trust, always verify.”

Instead of assuming everything inside the corporate network is safe, Zero Trust continuously validates:

  • Who is accessing data (Identity)

  • What device they’re using (Device Trust)

  • Where and how they’re connecting (Context)

  • What data or resources they’re requesting (Resource Sensitivity)

This approach ensures that only authenticated, authorized, and compliant users and devices can access corporate resources — no matter where they are.

Core Pillars of Zero Trust

  1. Verify Explicitly
    Always authenticate and authorize based on all available data points — user identity, device health, location, and risk.

  2. Use Least Privilege Access
    Limit user access with just-in-time (JIT) and just-enough-access (JEA) policies.

  3. Assume Breach
    Design defenses as if an attacker is already inside your network. Monitor, detect, and respond rapidly.

Implementing Zero Trust with Entra ID and Microsoft Intune

Together, Entra ID and Intune enable you to operationalize Zero Trust across the identity and endpoint layers. Here’s how each component fits in:

1. Identity Trust — Entra ID as the Core

Entra ID acts as the identity control plane for users, applications, and devices.
Key Zero Trust capabilities include:

  • Conditional Access Policies:
    Control who can access what, under which conditions.
    Example:

    Require MFA and compliant device for accessing SharePoint.

  • Multi-Factor Authentication (MFA):
    Protects accounts even if passwords are compromised.

  • Risk-Based Sign-In Protection:
    Detects unusual logins using Microsoft’s threat intelligence.

  • Privileged Identity Management (PIM):
    Grants admin rights only when needed — reducing standing privileges.

2. Device Trust — Intune for Endpoint Compliance

Intune ensures that only secure and compliant devices can access corporate data.

Key capabilities include:

  • Device Enrollment:
    Automatically enroll corporate and BYOD devices into Intune for policy management.
    (Supports Windows, macOS, iOS, Android)

  • Compliance Policies:
    Define what a “trusted device” means — encryption, passcode, antivirus, OS version, etc.

  • Conditional Access Integration:
    Intune reports compliance to Entra ID.
    If a device is non-compliant, access is automatically blocked until remediated.

  • App Protection Policies (MAM):
    For BYOD, protect corporate data inside managed apps — without full device control.

3. Network & Data Trust — Extending Protection Beyond the Device

Once identity and device posture are verified, extend Zero Trust deeper into the data and network layers:

  • Microsoft Defender for Endpoint → Provides device risk score and integrates with Intune.

  • Microsoft Information Protection (MIP) → Classify and protect data at the file level.

  • Defender for Cloud Apps → Enforces real-time session controls (block download, monitor usage).

 

Example: Conditional Access + Intune = Real Zero Trust

Here’s a typical policy flow:

  1. User signs into Microsoft 365 from a device.

  2. Entra ID evaluates the sign-in:

    • Is MFA completed?

    • Is device hybrid joined or compliant?

  3. If yes → access granted.
    If not → block or require remediation via Intune.

Result:
Only verified users on healthy devices can access corporate data — automatically and dynamically.

Getting Started: Zero Trust Roadmap

  1. Assess Current Environment

    • Audit existing Entra ID Conditional Access and Intune compliance policies.

  2. Secure Identities First

    • Enforce MFA for all users.

    • Enable passwordless sign-in (Windows Hello for Business, FIDO2 keys).

  3. Secure Devices

    • Enroll corporate devices into Intune.

    • Define compliance baselines and apply KFM (Known Folder Move) for data protection.

  4. Integrate Conditional Access

    • Require compliant or hybrid-joined devices for app access.

    • Enforce app-based access controls.

  5. Expand to Data and Applications

    • Enable Defender for Cloud Apps and Information Protection labels.

Final Thoughts

Zero Trust is not a single product — it’s a security mindset.
By leveraging Microsoft Entra ID and Intune, organizations can progressively implement Zero Trust controls across identity, devices, applications, and data — without disrupting productivity.

Start with protecting identities, then devices, and finally data.
Each layer you secure brings you closer to a truly resilient Zero Trust posture.