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 a user or system to confirm who is communicating, but does not restrict whether an unauthorized party can read the data itself.

Integrity ensures that data has not been altered or tampered with during transmission, but does not prevent an unauthorized party from viewing the original data.

Non-repudiation provides cryptographic proof that a specific party sent or received a message so they cannot deny the action, but it does not restrict data disclosure to unauthorized persons.

Confidentiality, typically enforced through encryption algorithms, ensures that data transmitted or stored can only be read by those with the proper decryption keys. On a local network, protocols implementing confidentiality render intercepted data unreadable to any unauthorized party who captures it.