To keep data safe and not to be accessed by any unauthorised user is known as

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Question: To keep data safe and not to be accessed by any unauthorised user is known as

Option 1: Non-repudiation
- This concept relates to preventing denial of a transmitted message or action after the fact, ensuring that a sender cannot later deny sending information. It is more about accountability and proof of origin than about restricting access to data.

Option 2: Authentication
- Authentication is about verifying the identity of a user or entity attempting to access a system. While it is a critical component of security, it does not by itself describe the ongoing protection of data from unauthorized access; it’s more about confirming who is trying to gain access.

Option 3: Confidentiality
- Confidentiality specifically concerns protecting data so that it is accessible only to authorized parties and not exposed to unauthorized users. This directly addresses keeping data safe from access by outsiders and aligns with the goal stated in the question.

Option 4: Data integrity
- Data integrity focuses on ensuring that information remains accurate, complete, and unaltered over its lifecycle. It guards against unauthorized modification, but it does not directly capture the aspect of preventing access by unauthorised users.

Summary:
- The key objective in the question is limiting access to data to authorized individuals only. Among the options, confidentiality is the principal concept that embodies protecting data from unauthorized access, whereas the other options address related but distinct security properties (non-repudiation, authentication, and data integrity).

To keep data safe and not to be accessed by any unauthorised user is known as

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