What is ISO 27001? How to Obtain and Implement It? Requirements, Steps, and Legal Obligations for Companies (2025)

📘 What is ISO 27001? How to Obtain and Implement It? Requirements, Steps, and Legal Obligations for Companies (2025)

Information security has become one of the most critical needs of the digital age. From protecting personal data to securing trade secrets, the rising expectations around cybersecurity have made the ISO 27001 Information Security Management System (ISMS) standard indispensable for organizations.

In this guide, we explain in detail what ISO 27001 is, how it is implemented and certified, when it becomes mandatory for companies, and the legal requirements in Turkey as of the 2025 updates.
📌 What is ISO 27001?

ISO/IEC 27001 is an international standard for establishing, implementing, maintaining, and continuously improving an information security management system (ISMS). It ensures that corporate information assets are protected based on the principles of confidentiality, integrity, and availability.

Through ISO 27001, companies can:

Identify and control information security risks,

Comply with legal regulations and customer requirements,

Protect and enhance their corporate reputation.

🛠️ How to Implement ISO 27001? (End-to-End Steps)

Define the Scope
Clarify which departments, processes, or services the ISMS will cover.

Risk Assessment & Asset Inventory
Identify critical information assets and perform risk analysis.

Selection of Controls & Implementation Plan
Evaluate and apply relevant controls from Annex A, which includes 93 control points.

Policy and Documentation
Create an information security policy, procedures, risk management plan, and other required documentation.

Training & Awareness
Provide awareness sessions and role-based training to employees.

Internal Audit & Management Review
Test the system through internal audits and report findings to management.

Continuous Improvement
Improve system performance based on feedback (PDCA cycle – Plan, Do, Check, Act).

📄 How to Obtain ISO 27001 Certification?

Preparation Phase
Analyze your current information security posture. Identify gaps against the ISO 27001 requirements.

System Setup & Implementation
Develop policies, assess risks, and implement relevant controls.

Internal Audit
Conduct internal audits to evaluate the ISMS's alignment with the standard.

Certification Audit
Undergo an audit by an accredited certification body (e.g., TÜRKAK, IAS, UKAS). If successful, you receive the certificate.

Surveillance Audits
The certificate is valid for 3 years, with annual surveillance audits required during this period.

⚖️ Is ISO 27001 Legally Mandatory?

While ISO 27001 certification is not legally mandatory for all companies, it is closely tied to many legal frameworks in Turkey:

KVKK (Turkish Personal Data Protection Law – No. 6698):
Requires “necessary technical and administrative measures” for data protection. ISO 27001 provides a structured approach to meet this requirement.

Law No. 5651 (Internet Law):
Supports obligations such as keeping logs, protecting traffic data, and ensuring the integrity of access records.

Regulations on Electronic Money and Payment Institutions (by BRSA):
Mandates information security management, for which ISO 27001 is considered a valid standard.

Contractual Requirements in Sectors like Health, Finance, Telecom, E-commerce, and Public:
Many tenders and business collaborations require ISO 27001 certification as a prerequisite.

💡 Who Should Get ISO 27001 Certified?

All companies handling data

Cloud and hosting service providers

E-commerce businesses

Banks and payment service providers

Healthcare institutions and hospitals

Universities and educational institutions

Public institutions and subsidiaries

🎯 Benefits of ISO 27001 Certification for Your Company

✔️ Easier compliance with regulations
✔️ Trust from customers and partners
✔️ Minimization of security risks
✔️ Competitive advantage and enhanced prestige
✔️ Improved corporate culture and employee awareness
✔️ Easier access to international markets
🏁 Conclusion

ISO 27001 is not just a certificate—it's a systematic and sustainable approach to managing corporate information security. As the value of data continues to rise, so does the necessity of systems designed to protect it.

Start implementing ISO 27001 today to safeguard your information assets, reduce legal risks, and gain a competitive edge.