Control mapping, audit evidence checklists, and implementation tips.
The ISO/IEC 27000 (ISO27k) family is the globally recognised framework for information security management. Many practitioners confuse ISO/IEC 27000, 27001, 27002 and 27005 because they work closely together in an Information Security Management System (ISMS). This article clarifies the distinct purpose, scope and relationship of these four core standards. ISO/IEC 27000 delivers foundational vocabulary and overview; ISO/IEC 27001 sets the auditable requirements for an ISMS and is the only certifiable standard among them; ISO/IEC 27002 provides a library of information security controls and implementation guidance; ISO/IEC 27005 defines the methodology for information security risk assessment and risk treatment. The article also explains the workflow connecting these standards, answering a common question: why organisations still need ISO/IEC 27005 even though ISO/IEC 27002 contains extensive security control guidance.
ISO 27001 is the globally recognized standard for establishing, implementing, maintaining, and continuously improving an Information Security Management System (ISMS), serving as a universal benchmark for enterprise information security credibility. This article clarifies the types of organizations that require ISO 27001 certification, covering data-sensitive industries, regulated enterprises, B2B service providers, and growth-oriented small and medium-sized enterprises (SMEs). It also analyzes the most common compliance challenges faced by certification-pursuing organizations, especially the gap between written security policies and executable technical controls for sensitive data protection, and illustrates how Data Loss Prevention (DLP) tools can address relevant ISO 27002 control requirements to help enterprises pass audits and achieve standardized data security management.
ISO/IEC 27002:2022 control 5.1 establishes the foundational framework for an organisation‑wide information‑security policy system, consisting of a top‑level information‑security policy and a set of supporting topic‑specific policies. While the overarching policy delivers high‑level management intent approved by senior management, topic‑specific policies translate abstract governance principles into domain‑oriented guidance to enable the implementation of information‑security controls. This article explains the core requirements of control 5.1 and elaborates on each of the twelve illustrative topic‑specific policy domains defined in the standard, covering their purpose, scope and practical positioning within an information‑security management system (ISMS).
Control 5.2 requires organizations to define, assign, document, communicate, and review information security roles and responsibilities. It is a preventive control that supports confidentiality, integrity, availability, and identification, and strengthens governance, protection, resilience, and the governance & ecosystem security domain. Responsibilities must cover asset protection, specific security processes, risk management including residual risk acceptance, and all users of organizational information and assets. Delegation is permitted, but accountability remains with the assigned person. Organizations should define authorization levels, ensure role competence, provide ongoing development, and obtain acknowledgment from personnel. Practical tools include role charters, RACI matrices, asset owner assignments, risk owner appointments, competence requirements, and performance metrics. For ISO 9001-certified organizations, Control 5.2 aligns closely with clauses on leadership, roles and authorities, risk, competence, awareness, communication, documented information, performance evaluation, and improvement.