When Trudy alters Alice's plain-text message before sending it to Bob, which two aspects of the CIA triad are violated?

When Trudy alters Alice's plain-text message before sending it to Bob, the two aspects of the CIA triad that are violated are confidentiality and integrity.

Confidentiality refers to protecting information from being accessed by unauthorized individuals. In this scenario, Trudy's alteration of the message does not directly compromise the confidentiality of the original message; however, it does imply that the message may not be kept secure from manipulation.

Integrity is crucial because it ensures that the information is accurate and trustworthy. When Trudy modifies Alice's message, she compromises the integrity of the information being communicated. Bob receives a version of the message that does not reflect Alice's original intent or content, which means the trustworthiness of the data has been violated.

While availability and authentication are important aspects of the CIA triad, they are not impacted directly by Trudy's alteration of the message in this scenario. Availability ensures that information is accessible when needed, and authentication verifies the identity of users involved in the communication. Since the focus of the question is on unauthorized alterations to a message, confidentiality and integrity are the primary concerns.