Alice, Bob, and Trudy are fictional characters commonly used to illustrate which aspect of information security?

The characters Alice, Bob, and Trudy are often used in information security to illustrate concepts related to the CIA Triad, which encompasses confidentiality, integrity, and availability. These three foundational principles are critical in the design and implementation of secure systems. In many examples, Alice and Bob represent legitimate users or entities who communicate securely, while Trudy often represents an attacker or an adversary attempting to intercept or manipulate communications.

In this context, scenarios involving Alice, Bob, and Trudy highlight various security challenges, such as ensuring that messages remain confidential from eavesdroppers (Trudy) and verifying that messages sent from one party (Alice to Bob) have not been altered in transit. By framing these concepts through relatable characters, the complexities of the CIA Triad become more understandable, making it easier to grasp how these core principles play a role in safeguarding information systems.

This choice directly relates to the fundamental goals of information security, whereas the other options, while relevant to security practices, do not use these specific characters for illustrative purposes.