What Is ISO 27001?
ISO/IEC 27001 is an international standard published by the International Organization for Standardization (ISO) that prescribes how organizations should establish, implement, and continually improve an Information Security Management System (ISMS). It is not a technical checklist; it is a management framework that identifies, prioritizes, and governs risks.
Why Does It Matter?
- Customer trust: Certification is evidence of an organizational commitment to information security
- Legal compliance: Contains controls that align with KVKK, GDPR, and sector-specific regulations
- Competitive advantage: Increasingly required in public tenders and corporate supplier selection processes
- Insurance: ISO 27001 certification can provide premium discounts on cyber risk insurance
Structure of the Standard
ISO 27001:2022 is aligned with other ISO management systems through its high-level structure and contains the following main clauses:
| Clause | Topic |
|---|---|
| 4 | Context of the organization |
| 5 | Leadership and commitment |
| 6 | Planning (risk assessment) |
| 7 | Support (resources, awareness) |
| 8 | Operation |
| 9 | Performance evaluation |
| 10 | Improvement |
The standard includes Annex A containing 93 controls. Organizations select applicable controls based on their risk assessment; it is not mandatory to implement all of them.
The Certification Process
A typical ISMS certification process is completed in four phases:
1. Scope Definition
The processes, systems, and locations to be included within the ISMS scope are determined.
2. Risk Assessment
An inventory of information assets is compiled, threats and vulnerabilities are analyzed, and risk levels are calculated. This phase is the foundation of the standard.
3. Implementation of Controls
Based on the risk assessment results, technical and administrative controls are put into practice:
- Access control (Active Directory, MFA)
- Encryption (VPN, TLS, disk encryption)
- Patch management and vulnerability scanning
- Incident management procedures
- Physical security controls
4. Internal Audit and Certification Audit
A two-stage audit is conducted by an accredited certification body (Stage 1: document review, Stage 2: on-site audit).
Implications for IT Infrastructure
The ISO 27001 certification process places the following responsibilities on IT teams:
- Asset inventory: Documentation of servers, network devices, software, and data repositories
- Access management: Role-based access control in accordance with the least privilege principle
- Log management: Maintaining event logs on critical systems and retaining them for a specified period
- Patch policy: Applying security patches within a defined timeframe
- Business continuity plan: Documenting disaster recovery and backup test results
Maintaining Certification
After certification is obtained, a renewal audit is conducted every three years, with surveillance audits annually. Internal audits and management reviews are repeated periodically.
Conclusion
ISO 27001 moves information security from reactive measures to a proactive management system. Certification is not merely an external prestige tool; it is a process that enhances internal security maturity. NRC Sistem provides support to organizations through ISO 27001 readiness consulting, risk assessment, and the implementation of technical controls.