What aspect of security does implementing access control measures mainly address?

Implementing access control measures primarily addresses data confidentiality. Access control is a fundamental aspect of security that governs who can view or use information in a computing environment. By restricting access to sensitive data and systems, organizations ensure that only authorized individuals can access specific information, thereby safeguarding it from unauthorized access and potential breaches.

Confidentiality is crucial because it prevents sensitive information from being exposed to users who do not have the necessary permissions. Effective access control mechanisms such as user authentication, role-based access control (RBAC), and permissions settings help maintain the confidentiality of data by enforcing stringent rules about who can access what data.

While system reliability, data integrity, and system performance are important aspects of a secure environment, they are not the primary concerns of access control measures. System reliability refers more to the availability and stability of systems rather than who has access to them. Data integrity focuses on ensuring that data is accurate and consistent over its lifecycle, and while access controls can help maintain integrity, they primarily serve to protect confidentiality. System performance, on the other hand, deals with how efficiently a system operates and is generally not affected directly by access controls.