What term describes an attempt by an unauthorized user to gain access to a system by posing as an authorized user?

• A. Masquerade
• B. Impersonation
• C. Phishing
• D. Spoofing

Answer: (A)

The term that best describes an attempt by an unauthorized user to gain access to a system by posing as an authorized user is masquerade. In the context of information security, a masquerade attack involves the perpetrator adopting the identity of a legitimate user in order to gain unauthorized access to sensitive information or system functionalities. This often entails using stolen credentials or exploiting vulnerabilities that allow the attacker to operate under a false identity.

While impersonation also involves assuming another's identity, it is a broader term not limited to just the digital realm. Phishing refers specifically to social engineering techniques used to trick users into revealing personal information, often through deceptive emails or websites. Spoofing generally refers to creating a false representation or identity to mislead other systems or users, which can include various methods like email spoofing, but does not specifically capture the aspect of masquerading as an authorized user accessing a system.

Thus, masquerade captures the specific nature of the attack in a cybersecurity context, highlighting the unauthorized access through assumed identities.