What is ISO 27001

ISO 27001 is the internationally recognised standard for information security management systems (ISMS). This guide explains what is ISO 27001, its core principles, and how organisations achieve certification. Whether you’re exploring ISO 27001 training courses or evaluating the standard for your business, this article provides everything you need to know.

In this article:

• What is ISO 27001?
• What is ISO 27001:2022?
• 3 ISO 27001 Principles
• Benefits of Using ISO 27001
• ISO 27001 Certification Process
• ISO 27001 CQI and IRCA Auditor Courses
• BSI Standards
• Enrol in an ISO 27001 Training Course
• Frequently Asked Questions

So, what is ISO 27001? It is a framework that helps organisations protect their information assets through systematic risk management. The standard specifies requirements for establishing, implementing, maintaining, and continually improving an information security management system.

Organisations of all sizes and sectors use ISO 27001 to safeguard sensitive data, manage security risks, and demonstrate their commitment to information protection to customers and stakeholders.

ISO 27001:2022 is the latest version of the standard, published in October 2022. This update modernises the framework to address evolving cybersecurity threats and technological changes.

Key updates in ISO 27001:2022 include:

• Restructured Annex A controls reduced from 114 to 93
• New controls addressing cloud security and threat intelligence
• Enhanced focus on organisational context and interested parties
• Alignment with current cybersecurity best practices

The standard is built upon three fundamental principles known as the CIA triad, which form the foundation of information security:

• Confidentiality – Ensuring information is accessible only to authorised individuals. This protects sensitive data from unauthorised disclosure.
• Integrity – Maintaining the accuracy and completeness of information. Data must remain unaltered and trustworthy throughout its lifecycle.
• Availability – Ensuring authorised users can access information when needed. Systems and data must be accessible and operational.

These three principles guide every aspect of ISMS implementation, from risk assessment to control selection.

Implementing ISO 27001 delivers significant advantages:

• Enhanced security posture – Systematic identification and treatment of information security risks.
• Regulatory compliance – Supports compliance with GDPR, NIS2, and other data protection regulations.
• Customer confidence – Certification demonstrates commitment to protecting client information.
• Competitive advantage – Many tenders and contracts require ISO 27001 certification.
• Reduced incident costs – Proactive risk management minimises the impact of security breaches.

Achieving certification involves a structured approach to implementing your ISMS:

Stage	Description
Gap Analysis	Assess current security practices against ISO 27001 requirements
Risk Assessment	Identify information assets, threats, and vulnerabilities
Control Implementation	Apply appropriate controls from Annex A
Internal Audit	Verify ISMS effectiveness before external assessment
Stage 1 Audit	Certification body reviews documentation readiness
Stage 2 Audit	On-site assessment of ISMS implementation
Certification	Certificate issued upon successful completion

Professional auditor training is essential for those conducting or managing ISO 27001 audits. CQI and IRCA certified courses provide internationally recognised qualifications.

The ISO 27001 Lead Auditor Course prepares professionals to lead third-party certification audits. This five-day programme covers audit planning, execution, reporting, and team leadership.

The ISO 27001 Internal Auditor Course equips participants to conduct effective internal ISMS audits. It covers audit techniques, evidence gathering, and reporting nonconformities.

The ISO 27001 Foundation Course provides an introduction to information security principles and ISO 27001 requirements. Ideal for those new to ISMS or seeking foundational knowledge.

The British Standards Institution (BSI) publishes the UK adopted version of ISO 27001. These documents are essential references for UK organisations implementing the standard.

BS EN ISO/IEC 27001:2023+A1:2024 is the current British Standard version incorporating the latest amendment. It provides the complete requirements for information security management systems.

BS EN ISO/IEC 27001:2023+A1:2024 – Tracked Changes highlights amendments from previous versions, making it easier to identify updates and ensure compliance.

Thorough understanding of this standard requires professional training. Our courses provide the knowledge and skills needed to implement, audit, and improve information security management systems effectively.

Ready to advance your information security expertise? Explore our ISO 27001 auditor courses and find the right programme for your career goals.