What security concept is being applied when a system requires proof of a user's claimed identity before granting access to resources?
Authentication
Confidentiality
Integrity
Availability
Authentication is the process of verifying that a user, device, or process is genuinely who or what it claims to be before access is allowed. Confidentiality protects data from unauthorized disclosure, integrity safeguards information from unauthorized alteration, and availability ensures systems remain usable when needed. None of those concepts specifically deal with verifying identity; that role belongs to authentication.
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