"authentication" is the answer.
https://learn.microsoft.com/en-us/training/modules/describe-identity-principles-concepts/2-define-authentication-authorization
Authentication is the process of proving that a person is who they say they are. When someone purchases an item with a credit card, they may be required to show an additional form of identification. This proves that they are the person whose name appears on the card. In this example, the user may show a driver’s license that serves as a form of authentication and proves their ID.
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