Which security concept is described by an attacker intercepting communications between two parties without their awareness?

• A. Man-in-the-middle attack
• B. Denial of Service
• C. Brute-force attack
• D. Spoofing

Answer: (A)

Intercepting communications between two parties without their awareness is a man-in-the-middle attack. In this scenario, the attacker inserts themselves into the communication channel between the two endpoints, often by tricking one party into connecting through a malicious device or by compromising a network device that sits in the path. Once between them, the attacker can eavesdrop on messages to capture sensitive data, alter information in transit, or impersonate one or both parties, all while the endpoints believe they are communicating directly with each other and remain unaware of the interception.

This differs from a Denial of Service, which aims to make a service unavailable by overwhelming it with traffic or requests; a Brute-force attack, which is about systematically guessing credentials or cryptographic keys; and Spoofing, which involves pretending to be someone else but does not inherently imply that traffic is being intercepted between two legitimate parties.