Technical Adversarial & Defensible Analysis (ISAUnited Expert Series)
A Practical Red and Blue Method for Threat Informed Security Architecture
 
By Arthur Chavez, Chief Security Architect, and Master Fellow of ISAUnited.org.
 
The ISAUnited Technical Adversarial & Defensible Analysis handbook introduces TADA as a practical method for studying modern cybersecurity architecture through both adversarial reasoning and defensible engineering judgment. Built around the principle “Think like the attacker. Build like an engineer.”, this handbook helps practitioners examine how compromise may begin, how it may move through architecture, and what defensive action should follow.
 
This volume gives architects, engineers, security practitioners, instructors, managers, and technical leaders a structured way to connect Red and Blue thinking. It brings together adversary progression, Threat Operations Functions, Intrusion 8, Threat Vectors, structured threat modeling, cyber threat intelligence enrichment, and Defensible 10 alignment into one repeatable method. The result is a disciplined path from understanding how compromise becomes possible to producing architecture grounded recommendations that can be reviewed, measured, and supported with evidence.
 
TADA moves beyond fragmented security reviews, generic control lists, and disconnected threat discussions. It teaches practitioners how to identify entry surfaces, exposure conditions, trust boundaries, paths of compromise, and realistic adversary behavior, then translate those findings into defensible security recommendations. Through real world scenarios, the handbook shows how the method applies across public facing applications, branch office networks, cloud service onboarding, and DevSecOps or software supply chain environments.
 
Whether you are a seasoned security architect, an engineer, a security leader, an instructor, or a practitioner building stronger technical judgment, this handbook provides a practical foundation for improving cybersecurity review quality, strengthening architecture decisions, and making defensive action more traceable and credible.
 
Adopt TADA as a disciplined method for transforming adversary understanding into defensible cybersecurity architecture, stronger engineering decisions, and measurable security outcomes. Think like the attacker. Build like an engineer.