How do you implement A.8.11 in Microsoft 365?

A.8.11 Data Masking can be implemented in Microsoft 365 using Microsoft Entra admin center (entra.microsoft.com) > Identity governance > Access reviews; Microsoft Purview > Information barriers. Contact Global Micro Solutions for a detailed implementation guide.

What does an auditor check for A.8.11?

Auditors verify that A.8.11 Data Masking is properly implemented by reviewing evidence from your M365 tenant, checking configuration against ISO 27001 requirements, and validating compliance documentation.

ISO 27001 A.8.11: Data Masking — M365 Implementation Guide | Global Micro Solutions

What is this control?

ISO 27001 control A.8.11 Data Masking limits unnecessary exposure of sensitive data including Personally Identifiable Information through a combination of strict access controls, data minimisation, native platform data masking features, and secure non-production environment handling. The control addresses risks of sensitive data exposure during development, testing, analytics, or support scenarios where individuals without legitimate need-to-know might access it.

How to implement in Microsoft 365

Implement A.8.11 by applying the principle of Least Privilege Access to restrict who can view sensitive data in the first place. Configure SQL Server Dynamic Data Masking for structured data in SQL Server Managed Instance or VMs. Implement Microsoft Entra Conditional Access, Azure RBAC, and Microsoft Entra PIM for access-based data masking.

Configure Microsoft Purview Sensitivity Labels with protection settings including encryption, content marking, and watermarks. Deploy Microsoft Purview Data Loss Prevention policies across Exchange, SharePoint, OneDrive, and Teams. Restrict access to logs containing potentially sensitive information via Azure RBAC on Log Analytics workspaces.

What an auditor looks for

Auditors will verify RBAC and Conditional Access policies are configured and enabled for data access control. They will check Sensitivity labels are configured with protection settings including encryption or content marking. Auditors will verify Azure Log Analytics RBAC is configured to restrict access to log data.

They will check DLP policies are deployed across M365 workloads to detect and block sensitive data sharing. Auditors will verify Test Tenant data handling procedures are documented with approval records for any production data use.