Which ISO standard focuses on the establishment, implementation, control, and improvement of an Information Security Management System (ISMS)?

The choice that identifies the ISO standard focused on the establishment, implementation, control, and improvement of an Information Security Management System (ISMS) is ISO 27001. This standard provides a systematic approach to managing sensitive company information, ensuring its confidentiality, integrity, and availability.

ISO 27001 lays out the requirements for setting up an ISMS, which includes assessing and managing information security risks. It incorporates a continual improvement model, emphasizing the need for ongoing evaluation and enhancement of the system. By following the ISO 27001 framework, organizations can ensure that they proactively address potential security threats and comply with various legal, regulatory, and contractual requirements related to information security.

In contrast, other ISO standards serve different purposes:

• ISO 27002 provides guidelines and best practices for information security controls, focusing on the implementation of those controls outlined in ISO 27001.

• ISO 27004 deals with the measurement and evaluation of the ISMS's effectiveness, which, while related, does not focus on the establishment and improvement of the ISMS itself.

• ISO 27005 specifically addresses the risk management aspect within an information security context, aiming to establish a framework for managing information security risks, rather than focusing on the overall setup and maintenance of