ISO/IEC 27001 is the internationally recognized standard for Information Security Management Systems (ISMS)

ISO/IEC 27001 is the internationally recognized standard for Information Security Management Systems (ISMS). Jointly published by the International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC), it provides a structured framework to protect confidential data, manage cyber risks, and demonstrate operational resilience.Core Pillars of ISO 27001The standard centers on the CIA Triad to protect information assets across physical, technical, and organizational layers:Confidentiality: Ensuring information is accessible only to authorized individuals.Integrity: Safeguarding the accuracy and completeness of data and processing methods.Availability: Ensuring authorized users have access to information and associated assets when needed.The Risk-Based Approach (Plan-Do-Check-Act)ISO 27001 does not mandate specific technical solutions; instead, it enforces a continuous improvement cycle centered on risk assessment and risk treatment: ┌───────────────────────────────┐
│ PLAN │
│ • Define ISMS Scope │
│ • Conduct Risk Assessment │
│ • Formulate Risk Treatment │
└──────────────┬────────────────┘
│
▼
┌───────────────────────────────┐
│ DO │
│ • Implement Controls │
│ • Train Employees │
│ • Manage Operations │
└──────────────┬────────────────┘
│
▼
┌───────────────────────────────┐
│ CHECK │
│ • Internal Audits │
│ • Management Reviews │
│ • Monitor Metrics │
└──────────────┬────────────────┘
│
▼
┌───────────────────────────────┐
│ ACT │
│ • Corrective Actions │
│ • Continuous Improvement │
└───────────────────────────────┘
Risk Assessment: Identifying information assets, potential threats, vulnerabilities, and potential business impacts.Statement of Applicability (SoA): Documenting which ISO 27001 controls are applicable to the organization based on the risk assessment results.Risk Treatment Plan (RTP): Defining specific measures (mitigate, transfer, avoid, or accept) to manage identified risks.Structure of the ISO 27001 StandardThe document is divided into two primary sections: main clauses (requirements for compliance) and Annex A (control catalog).Main Clauses (Clause 4 – Clause 10)Clause 4: Context of the Organization – Understanding internal/external issues and defining the ISMS scope.Clause 5: Leadership – Securing top management commitment, defining roles, and establishing the security policy.Clause 6: Planning – Assessing risks, setting security objectives, and planning control implementation.Clause 7: Support – Allocating resources, raising security awareness, and managing documented information.Clause 8: Operation – Executing risk assessments, risk treatment plans, and operational processes.Clause 9: Performance Evaluation – Conducting internal audits, monitoring performance, and management reviews.Clause 10: Improvement – Addressing non-conformities and driving continual improvement.Control Domains (Annex A - ISO 27001:2022 Update)The updated ISO/IEC 27001:2022 revision consolidated controls into 4 main themes (comprising 93 controls total):ThemeFocus AreaExample ControlsOrganizational ControlsGovernance, policy, and third-party riskAsset management, threat intelligence, identity managementPeople ControlsHuman resource security and awarenessBackground screening, remote working policies, awareness trainingPhysical ControlsPerimeter and facility protectionPhysical entry controls, clear desk/screen policy, equipment maintenanceTechnological ControlsSystems, network, and data protectionAccess control, cryptography, data leakage prevention (DLP), secure coding