A cybersecurity first principle strategy focused on disrupting known adversary activity at one of several phases of an attack sequence. CyberWire Glossary link: https://thecyberwire.com/glossary/intrusion-kill-chain Audio reference link:"Cybersecurity Days: A Network Defender's Future," by Rick Howard, Integrated Cyber Conference, Integrated Adaptive Cyber Defense (IACD), YouTube, 26 October 2018.