Which of the following cryptographic system services ensures that information will not be disclosed to any unauthorized person on a local network?

Authentication verifies the identity of users or systems but does not inherently prevent data disclosure once identity is established or if data is intercepted.

Integrity ensures that information has not been altered or destroyed by unauthorized means, focusing on data accuracy and trustworthiness, not disclosure.

Non-repudiation provides undeniable proof of an action's origin or delivery, preventing parties from falsely denying involvement, but does not prevent unauthorized disclosure.

Confidentiality ensures that information is accessible only to those authorized to have access and is protected from unauthorized disclosure. In a cryptographic system, this is typically achieved through encryption, rendering data unreadable to anyone without the appropriate decryption key, even if intercepted on a local network.