What aspect of CIA is demonstrated by verifying the sender of a document?

Verifying the sender of a document is an essential aspect of authentication. Authentication refers to the process of confirming the identity of a user, system, or entity, ensuring that the entity requesting access or attempting to communicate is who they claim to be. When you verify the sender of a document, you are establishing that the person or system is indeed the legitimate source of that document, which is critical for trust in communications.

This process often involves checking digital signatures, authentication tokens, or other confirming identifiers against a trusted source. When authentication is upheld, it contributes to the overall security and trustworthiness of the information being exchanged. In contrast, integrity pertains to ensuring that the information has not been altered, confidentiality focuses on protecting information from unauthorized access, and availability ensures that information and resources are accessible when required. However, none of those directly relate to the identity of the sender, making authentication the most relevant concept in this context.