ISO 27001:2022 Annex A Control 8.11

Data Masking

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Purpose of ISO 27001:2022 Annex A 8.11

Data masking is a technique used to safeguard sensitive data, notably personal identifiable information (PII), beyond the customary security protocols of an organisation, such as access control.

Data masking is routinely mentioned in legal, statutory and regulatory instructions governing the keeping and access of staff, customer, user and vendor data.

Ownership of Annex A 8.11

Data masking is a intricate technical procedure involving changing delicate info and barring users from identifying data subjects through a range of approaches.

Data masking is directly related to an organisation’s ability to stay compliant with laws, regulations, and guidelines about storing, accessing, and processing data. Therefore, the Chief Information Security Officer or their equivalent should have ownership of this administrative task.

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General Guidance on ISO 27001:2022 Annex A 8.11 Compliance

Annex A 8.11 encourages organisations to contemplate data masking through two main techniques – pseudonymisation and/or anonymisation. These techniques are meant to conceal the true purpose of PII by severing the connection between the raw data and the subject (commonly a person).

Organisations ought to take great care to guarantee that no single piece of data exposes the subject’s identity.

Organisations should take into account the following when employing either of these methods:

  • The degree of pseudonymisation and/or anonymisation necessary, depending on the kind of data.

  • Discover how the masked data is accessed. Examine the steps involved and the methods used to ensure secure access.

  • Any binding agreements that limit utilisation of the data must be concealed.

  • It is essential to keep the masked data distinct from any other type of data so that the subject of the data cannot be quickly identified.

  • Record the date the data was acquired and the manner of its distribution to either internal or external parties.

Guidance on Additional Techniques

Pseudonymisation and anonymisation are not the only ways available to organisations seeking to obscure PII or confidential data. ISO 27001:2022 Annex A 8.11 outlines five other approaches that can be adopted to enhance data security:

  1. Encryption using keys.

  2. The deletion or omission of characters within the dataset.

  3. Vary the numbers and dates used.

  4. Substituting values throughout the data.

  5. Hash-based value masking.

Guidance on Data Masking Principles

Data masking is a vital element of an organisation’s policy for protecting PII and guaranteeing the anonymity of the people whose data is held.

Organisations should take into account the following when constructing their data masking strategy:

  • Implement masking techniques to expose only the lowest possible amount of data to those who use it.

  • At the request of the subject, certain pieces of data may be hidden (obfuscated) and staff access to relevant sections is restricted to only certain members.

  • Constructing their data masking procedure in accordance with legal and regulatory requirements.

  • Pseudonymisation requires the use of an algorithm to unmask the data, and this must be kept secure.

Changes and Differences from ISO 27001:2013

ISO 27001:2022 Annex A 8.11 is a new addition not present in ISO 27001:2013.

Table of All ISO 27001:2022 Annex A Controls

In the table below you’ll find more information on each individual ISO 27001:2022 Annex A Control.

ISO 27001:2022 Organisational Controls

Annex A Control TypeISO/IEC 27001:2022 Annex A IdentifierISO/IEC 27001:2013 Annex A IdentifierAnnex A Name
Organisational ControlsAnnex A 5.1Annex A 5.1.1
Annex A 5.1.2		Policies for Information Security
Organisational ControlsAnnex A 5.2Annex A 6.1.1Information Security Roles and Responsibilities
Organisational ControlsAnnex A 5.3Annex A 6.1.2Segregation of Duties
Organisational ControlsAnnex A 5.4Annex A 7.2.1Management Responsibilities
Organisational ControlsAnnex A 5.5Annex A 6.1.3Contact With Authorities
Organisational ControlsAnnex A 5.6Annex A 6.1.4Contact With Special Interest Groups
Organisational ControlsAnnex A 5.7NEWThreat Intelligence
Organisational ControlsAnnex A 5.8Annex A 6.1.5
Annex A 14.1.1		Information Security in Project Management
Organisational ControlsAnnex A 5.9Annex A 8.1.1
Annex A 8.1.2		Inventory of Information and Other Associated Assets
Organisational ControlsAnnex A 5.10Annex A 8.1.3
Annex A 8.2.3		Acceptable Use of Information and Other Associated Assets
Organisational ControlsAnnex A 5.11Annex A 8.1.4Return of Assets
Organisational ControlsAnnex A 5.12Annex A 8.2.1Classification of Information
Organisational ControlsAnnex A 5.13Annex A 8.2.2Labelling of Information
Organisational ControlsAnnex A 5.14Annex A 13.2.1
Annex A 13.2.2
Annex A 13.2.3		Information Transfer
Organisational ControlsAnnex A 5.15Annex A 9.1.1
Annex A 9.1.2		Access Control
Organisational ControlsAnnex A 5.16Annex A 9.2.1Identity Management
Organisational ControlsAnnex A 5.17Annex A 9.2.4
Annex A 9.3.1
Annex A 9.4.3		Authentication Information
Organisational ControlsAnnex A 5.18Annex A 9.2.2
Annex A 9.2.5
Annex A 9.2.6		Access Rights
Organisational ControlsAnnex A 5.19Annex A 15.1.1Information Security in Supplier Relationships
Organisational ControlsAnnex A 5.20Annex A 15.1.2Addressing Information Security Within Supplier Agreements
Organisational ControlsAnnex A 5.21Annex A 15.1.3Managing Information Security in the ICT Supply Chain
Organisational ControlsAnnex A 5.22Annex A 15.2.1
Annex A 15.2.2		Monitoring, Review and Change Management of Supplier Services
Organisational ControlsAnnex A 5.23NEWInformation Security for Use of Cloud Services
Organisational ControlsAnnex A 5.24Annex A 16.1.1Information Security Incident Management Planning and Preparation
Organisational ControlsAnnex A 5.25Annex A 16.1.4Assessment and Decision on Information Security Events
Organisational ControlsAnnex A 5.26Annex A 16.1.5Response to Information Security Incidents
Organisational ControlsAnnex A 5.27Annex A 16.1.6Learning From Information Security Incidents
Organisational ControlsAnnex A 5.28Annex A 16.1.7Collection of Evidence
Organisational ControlsAnnex A 5.29Annex A 17.1.1
Annex A 17.1.2
Annex A 17.1.3		Information Security During Disruption
Organisational ControlsAnnex A 5.30NEWICT Readiness for Business Continuity
Organisational ControlsAnnex A 5.31Annex A 18.1.1
Annex A 18.1.5		Legal, Statutory, Regulatory and Contractual Requirements
Organisational ControlsAnnex A 5.32Annex A 18.1.2Intellectual Property Rights
Organisational ControlsAnnex A 5.33Annex A 18.1.3Protection of Records
Organisational ControlsAnnex A 5.34 Annex A 18.1.4Privacy and Protection of PII
Organisational ControlsAnnex A 5.35Annex A 18.2.1Independent Review of Information Security
Organisational ControlsAnnex A 5.36Annex A 18.2.2
Annex A 18.2.3		Compliance With Policies, Rules and Standards for Information Security
Organisational ControlsAnnex A 5.37Annex A 12.1.1Documented Operating Procedures

ISO 27001:2022 People Controls

Annex A Control TypeISO/IEC 27001:2022 Annex A IdentifierISO/IEC 27001:2013 Annex A IdentifierAnnex A Name
People ControlsAnnex A 6.1Annex A 7.1.1Screening
People ControlsAnnex A 6.2Annex A 7.1.2Terms and Conditions of Employment
People ControlsAnnex A 6.3Annex A 7.2.2Information Security Awareness, Education and Training
People ControlsAnnex A 6.4Annex A 7.2.3Disciplinary Process
People ControlsAnnex A 6.5Annex A 7.3.1Responsibilities After Termination or Change of Employment
People ControlsAnnex A 6.6Annex A 13.2.4Confidentiality or Non-Disclosure Agreements
People ControlsAnnex A 6.7Annex A 6.2.2Remote Working
People ControlsAnnex A 6.8Annex A 16.1.2
Annex A 16.1.3		Information Security Event Reporting

ISO 27001:2022 Physical Controls

Annex A Control TypeISO/IEC 27001:2022 Annex A IdentifierISO/IEC 27001:2013 Annex A IdentifierAnnex A Name
Physical ControlsAnnex A 7.1Annex A 11.1.1Physical Security Perimeters
Physical ControlsAnnex A 7.2Annex A 11.1.2
Annex A 11.1.6		Physical Entry
Physical ControlsAnnex A 7.3Annex A 11.1.3Securing Offices, Rooms and Facilities
Physical ControlsAnnex A 7.4NEWPhysical Security Monitoring
Physical ControlsAnnex A 7.5Annex A 11.1.4Protecting Against Physical and Environmental Threats
Physical ControlsAnnex A 7.6Annex A 11.1.5Working In Secure Areas
Physical ControlsAnnex A 7.7Annex A 11.2.9Clear Desk and Clear Screen
Physical ControlsAnnex A 7.8Annex A 11.2.1Equipment Siting and Protection
Physical ControlsAnnex A 7.9Annex A 11.2.6Security of Assets Off-Premises
Physical ControlsAnnex A 7.10Annex A 8.3.1
Annex A 8.3.2
Annex A 8.3.3
 Annex A 11.2.5		Storage Media
Physical ControlsAnnex A 7.11Annex A 11.2.2Supporting Utilities
Physical ControlsAnnex A 7.12Annex A 11.2.3Cabling Security
Physical ControlsAnnex A 7.13Annex A 11.2.4Equipment Maintenance
Physical ControlsAnnex A 7.14Annex A 11.2.7Secure Disposal or Re-Use of Equipment

ISO 27001:2022 Technological Controls

Annex A Control TypeISO/IEC 27001:2022 Annex A IdentifierISO/IEC 27001:2013 Annex A IdentifierAnnex A Name
Technological ControlsAnnex A 8.1Annex A 6.2.1
Annex A 11.2.8		User Endpoint Devices
Technological ControlsAnnex A 8.2Annex A 9.2.3Privileged Access Rights
Technological ControlsAnnex A 8.3Annex A 9.4.1Information Access Restriction
Technological ControlsAnnex A 8.4Annex A 9.4.5Access to Source Code
Technological ControlsAnnex A 8.5Annex A 9.4.2Secure Authentication
Technological ControlsAnnex A 8.6Annex A 12.1.3Capacity Management
Technological ControlsAnnex A 8.7Annex A 12.2.1Protection Against Malware
Technological ControlsAnnex A 8.8Annex A 12.6.1
Annex A 18.2.3		Management of Technical Vulnerabilities
Technological ControlsAnnex A 8.9NEWConfiguration Management
Technological ControlsAnnex A 8.10NEWInformation Deletion
Technological ControlsAnnex A 8.11NEWData Masking
Technological ControlsAnnex A 8.12NEWData Leakage Prevention
Technological ControlsAnnex A 8.13Annex A 12.3.1Information Backup
Technological ControlsAnnex A 8.14Annex A 17.2.1Redundancy of Information Processing Facilities
Technological ControlsAnnex A 8.15Annex A 12.4.1
Annex A 12.4.2
Annex A 12.4.3		Logging
Technological ControlsAnnex A 8.16NEWMonitoring Activities
Technological ControlsAnnex A 8.17Annex A 12.4.4Clock Synchronization
Technological ControlsAnnex A 8.18Annex A 9.4.4Use of Privileged Utility Programs
Technological ControlsAnnex A 8.19Annex A 12.5.1
Annex A 12.6.2		Installation of Software on Operational Systems
Technological ControlsAnnex A 8.20Annex A 13.1.1Networks Security
Technological ControlsAnnex A 8.21Annex A 13.1.2Security of Network Services
Technological ControlsAnnex A 8.22Annex A 13.1.3Segregation of Networks
Technological ControlsAnnex A 8.23NEWWeb filtering
Technological ControlsAnnex A 8.24Annex A 10.1.1
Annex A 10.1.2		Use of Cryptography
Technological ControlsAnnex A 8.25Annex A 14.2.1Secure Development Life Cycle
Technological ControlsAnnex A 8.26Annex A 14.1.2
Annex A 14.1.3		Application Security Requirements
Technological ControlsAnnex A 8.27Annex A 14.2.5Secure System Architecture and Engineering Principles
Technological ControlsAnnex A 8.28NEWSecure Coding
Technological ControlsAnnex A 8.29Annex A 14.2.8
Annex A 14.2.9		Security Testing in Development and Acceptance
Technological ControlsAnnex A 8.30Annex A 14.2.7Outsourced Development
Technological ControlsAnnex A 8.31Annex A 12.1.4
Annex A 14.2.6		Separation of Development, Test and Production Environments
Technological ControlsAnnex A 8.32Annex A 12.1.2
Annex A 14.2.2
Annex A 14.2.3
Annex A 14.2.4		Change Management
Technological ControlsAnnex A 8.33Annex A 14.3.1Test Information
Technological ControlsAnnex A 8.34Annex A 12.7.1Protection of Information Systems During Audit Testing

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