Definition
A kill chain is a cybersecurity framework that models the stages of a cyberattack, from initial reconnaissance to achieving the attacker's objective. It breaks down an attack into distinct phases, allowing defenders to identify and disrupt the adversary's progress at any point. Understanding the kill chain helps security professionals anticipate threats and implement effective countermeasures. For instance, recognizing an attacker's reconnaissance phase might lead to stricter access controls or network segmentation. This concept differs from a simple vulnerability assessment by focusing on the entire attack lifecycle rather than isolated weaknesses. The kill chain is a fundamental concept tested on certifications like CompTIA Security+ and CySA+.