What does the confidentiality aspect of the CIA triad ensure?

The confidentiality aspect of the CIA triad is primarily concerned with ensuring that sensitive information is only accessible to individuals who have the appropriate permissions or need to know. This principle aims to protect data from unauthorized access and disclosure, thereby maintaining the privacy of information.

When confidentiality is maintained, organizations implement controls such as access controls, encryption, and secure authentication mechanisms to safeguard their data. This ensures that sensitive data, whether it be personal information, proprietary business knowledge, or classified materials, remains protected and is only available to authorized users who require that information to perform their duties.

The relevance of the other choices lies in the different aspects of information security they address. While "no unauthorized changes to the file" pertains more to integrity, "data is accessible during an emergency" focuses on availability, and "data is stored securely on the server" relates to both confidentiality and integrity. However, the essence of confidentiality is specifically about restricting data access to those who legitimately require it, making the correct answer clear.