ISO 27001 Information Security Management System

ISO 27001 Requirements

ISO 27001 consists of mandatory requirements (clauses 4-10) and Annex A controls.

🔹 Mandatory Requirements (Clauses 4-10)

1️⃣ Context of the Organization (Clause 4)

✅ Define the scope of the Information Security Management System (ISMS)
✅ Identify internal & external factors affecting security
✅ Establish stakeholder requirements (e.g., customers, regulators)

2️⃣ Leadership (Clause 5)

✅ Obtain top management commitment
✅ Define roles, responsibilities, and authorities
✅ Establish and communicate an Information Security Policy

3️⃣ Planning (Clause 6)

✅ Conduct risk assessment & risk treatment (ISO 31000 methodology)
✅ Define a Statement of Applicability (SoA) listing relevant security controls
✅ Establish objectives for ISMS

4️⃣ Support (Clause 7)

✅ Allocate resources for ISMS implementation
✅ Train employees on security awareness
✅ Maintain documented policies, procedures, and records

5️⃣ Operation (Clause 8)

✅ Implement security risk treatment plans
✅ Define and apply security controls from Annex A
✅ Ensure secure handling of data, assets, and IT systems

6️⃣ Performance Evaluation (Clause 9)

✅ Monitor ISMS effectiveness using KPIs
✅ Conduct internal audits
✅ Perform management reviews

7️⃣ Improvement (Clause 10)

✅ Address non-conformities and implement corrective actions
✅ Continuously improve the ISMS using the PDCA (Plan-Do-Check-Act) cycle

ISO 27001:2022 Annex A - List of 93 Requirements

A.5 Operational Controls

5.1 Policies for Information Security

5.2 Information Security Roles & Responsibilities

5.3 Segregation of Duties

5.4 Management Responsibilities

5.5 Contact with Authorities

5.6 Contact with Special Interest Groups

5.7 Threat Intelligence

5.8 Information Security in Project Management

A.6 People Controls

6.1 Screening

6.2 Terms & Conditions of Employment

6.3 Information Security Awareness, Education & Training

6.4 Disciplinary Process

6.5 Responsibilities after Termination or Change of Employment

A.7 Physical Controls

7.1 Physical Security Perimeter

7.2 Physical Entry Controls

7.3 Securing Offices, Rooms, and Facilities

7.4 Protecting Against Physical & Environmental Threats

7.5 Working in Secure Areas

7.6 Equipment Security

7.7 Secure Disposal or Reuse of Equipment

A.8 Technological Controls

8.1 User Endpoint Protection

8.2 Privileged Access Management

8.3 Information Access Restriction

8.4 Access to Source Code

8.5 Secure Authentication

8.6 Capacity Management

8.7 Protection Against Malware

8.8 Management of Technical Vulnerabilities

8.9 Configuration Management

8.10 Change Management

8.11 Data Masking

8.12 Data Leakage Prevention

8.13 Monitoring Activities

8.14 Protection of Logs

8.15 Clock Synchronization

8.16 Application Security Requirements

8.17 Secure Development

8.18 Secure System Architecture

8.19 Secure Coding

8.20 Security Testing in Development & Acceptance

8.21 Outsourced Development Security

8.22 System Acceptance Testing

8.23 Information Deletion

8.24 Data Masking

8.25 Data Leakage Prevention

8.26 Monitoring & Logging

8.27 Security of Network Services

8.28 Secure Exchange of Information

8.29 Secure Communication

8.30 Security of Transferred Data

8.31 Redundancy of Systems

8.32 Backup & Recovery

8.33 Secure Disposal of Equipment

8.34 Physical Security of Equipment

8.35 Cloud Security

A.9 Organizational Controls

9.1 Business Continuity Planning

9.2 Risk Management

9.3 Compliance with Legal & Regulatory Requirements

9.4 Privacy & Data Protection

9.5 Supplier Relationship Security

9.6 Incident Management & Reporting

9.7 Cybersecurity Monitoring & Detection

9.8 Security Awareness & Training

9.9 Secure Use of Mobile Devices

9.10 Security of Remote Working

9.11 Identity & Access Management

9.12 Secure Configuration & Hardening

9.13 Secure Development Lifecycle

9.14 Penetration Testing & Vulnerability Management

9.15 Encryption & Key Management

9.16 Network Segmentation

9.17 Zero Trust Security Model

This list made by covers all 93 controls categorized under Operational, People, Physical, Technological, and Organizational controls as per ISO 27001:2022 Annex A.

ISO 27001 Implementation Checklist

1️⃣ Initial Preparation

✅ Define ISMS scope (business units, locations, assets)
✅ Secure management support and budget allocation
✅ Appoint an ISO 27001 project team
✅ Establish an implementation timeline

2️⃣ Risk Assessment & Treatment

✅ Identify information security risks (cyber threats, data breaches, insider threats)
✅ Conduct risk assessment (ISO 31000 methodology)
✅ Develop a Risk Treatment Plan (RTP)
✅ Document the Statement of Applicability (SoA)
✅ Implement risk mitigation measures (firewalls, encryption, access controls)

3️⃣ ISO 27001 Documentation

✅ Information Security Policy
✅ Risk Management Policy
✅ Access Control Policy
✅ Incident Response Plan
✅ Business Continuity Plan (BCP)
✅ Supplier & Third-Party Security Agreements

4️⃣ Implementation of Controls (Annex A)

✅ Organizational Controls – Security roles, policies, compliance tracking
✅ People Controls – Security awareness training, HR security measures
✅ Physical Controls – Data center security, CCTV, visitor management
✅ Technological Controls – SIEM, DLP, endpoint security, data encryption

5️⃣ Monitoring & Continuous Improvement

✅ Conduct internal security audits
✅ Track compliance KPIs (e.g., incident response time, policy violations)
✅ Perform a management review
✅ Address non-conformities and update ISMS policies

6️⃣ Certification Process

✅ Hire an ISO 27001 accredited certification body
✅ Undergo Stage 1 Audit – Documentation review
✅ Undergo Stage 2 Audit – On-site assessment
✅ Implement corrective actions (if required)
✅ Obtain ISO 27001 Certification 🎉

7️⃣ Post-Certification Maintenance

✅ Conduct regular audits and risk assessments
✅ Continuously improve security policies based on new threats
✅ Stay compliant with legal and regulatory changes