Ensuring Information Confidentiality on Local Networks

D.

The cryptographic system service that ensures that information will not be disclosed to any unauthorized person on a local network is confidentiality.

Confidentiality is the process of ensuring that information is accessible only to those authorized to have access. In cryptographic systems, confidentiality is achieved through the use of encryption, which transforms plaintext (i.e., clear, readable text) into ciphertext (i.e., unintelligible text that can only be read by those who have the key to decrypt it).

Encryption protects information from being read or accessed by unauthorized persons who may be eavesdropping on the network. For example, if a user sends a message over an unsecured network, anyone with access to the network could intercept and read the message. However, if the message is encrypted, the interceptor would not be able to read it without the decryption key.

Authentication is the process of verifying the identity of a user or system, ensuring that the user or system is who they claim to be. This helps to prevent unauthorized access to systems and data.

Integrity is the process of ensuring that data has not been tampered with or modified in an unauthorized way. This helps to ensure that data is accurate and reliable.

Non-repudiation is the process of ensuring that a user cannot deny having performed an action (such as sending a message or performing a transaction) that they did in fact perform. This helps to ensure accountability and prevent fraud.

While authentication, integrity, and non-repudiation are all important aspects of information security, confidentiality is the cryptographic system service that specifically addresses the protection of information from unauthorized disclosure on a local network.