An unauthorized individual enters a building following an employee through the employee entrance after the lunch rush. What type of breach has the individual just performed?

Reverse social engineering involves the attacker fabricating a problem and positioning themselves as the solution so the victim initiates contact, which is a deception-based technique unrelated to physical entry.

Tailgating occurs when an attacker exploits an authorized person's access by closely following them through a secured door without the authorized person being aware or giving explicit permission. In this scenario, the attacker uses the high-volume post-lunch foot traffic to slip through the employee entrance undetected. This attack bypasses electronic access controls entirely by exploiting human behavior and physical proximity.

Piggybacking is technically distinct from tailgating because it requires the authorized individual to be aware of and knowingly allow the unauthorized person to enter alongside them.

Announced is not a recognized or defined category of physical security breach in standard security certification curricula or frameworks.