Conditional Access Based on Device Trust (Zero Trust Access Control)

The Problem

Users can access corporate apps from unmanaged or non-compliant devices. 

Without device trust checks, identity controls alone cannot confirm device posture, making it easier for compromised, outdated, or risky endpoints to access sensitive resources.

Organisations face a difficult balance between security and productivity when controls are not context-aware.

Diagram showing access attempts from compliant and non-compliant devices, illustrating conditional access outcomes such as allow, step-up, restrict, or block based on device trust.

 

How we solve it: Enforce device posture checks and conditional access decisions based on compliance and trust signals.

We implement device-trust-driven access control so applications and sensitive resources are protected by posture-aware policies.

  • Define trust signals and policy tiers
    We define which posture signals matter (encryption, OS level, compliance status, risky apps) and map them to access outcomes.
  • Conditional access decisions
    We enforce allow, restrict, step-up, or block decisions based on compliance and risk.
  • Exception governance
    We implement controlled exceptions with time bounds and evidence, avoiding informal bypass paths.

Flow showing device posture signals feeding a conditional access policy decision to allow, restrict, step-up, or block access, with logging for evidence.

 

Expected outcome

  • Stronger Zero Trust controls by enforcing device trust before granting access
  • Reduced exposure from unmanaged and non-compliant devices
  • Less disruption through risk-tiered policies and step-up rather than blanket blocks
  • Improved audit posture by evidencing posture-aware access decisions

KPI snapshot for device-trust conditional access, including blocked non-compliant access attempts, step-up triggers, and exception governance.

 

Quick Answers

What is device trust in Zero Trust?
A posture-based assessment that confirms a device meets compliance requirements before access is granted.

Why is identity alone not enough?
Identity cannot confirm whether the device is encrypted, updated, or managed; device posture adds that assurance layer.

How do you avoid blocking legitimate work?
By using tiered outcomes such as restricted access or step-up authentication rather than blanket denial.