Which term describes a digital signature's ability to confirm a sender's authenticity?

The correct term that describes a digital signature's ability to confirm a sender's authenticity is non-repudiation. Non-repudiation ensures that a sender cannot deny having sent a message because the digital signature securely ties the identity of the signer to the document. This means that once a digital signature is applied, the signer takes full responsibility for that communication, providing legal assurance of their commitment to the content.

In this context, non-repudiation plays a crucial role in digital communications, enhancing trust and accountability. It ensures that both parties in a transaction can verify the authenticity of the signature and, consequently, the sender's identity, thus preventing any future claims by the signer that they did not send the message.

While other concepts like integrity, confidentiality, and authentication are important in cybersecurity, they serve different purposes. Integrity ensures that the data has not been altered in transit, confidentiality protects the information from being accessed by unauthorized parties, and authentication verifies that the sender is indeed who they claim to be. However, non-repudiation is specifically focused on preventing the sender from disavowing their signature and maintaining accountability in electronic communications.