Systems & Security — Dani Decodes Cyber
Thursday Series

SYSTEMS &
SECURITY

Engineering as a discipline provides the foundational mental models for cybersecurity, OT/ICS security, policy, and law. Every Thursday, a new essay at the intersection of how systems are built and how they fail — written by a defense systems engineer who has operated inside both worlds.

Defense Systems Engineering OT/ICS Security Critical Infrastructure Regulatory Law Publishes Thursdays
By Danielle Peters · Decode Media · Every Thursday
The Thesis
Systems engineering and cybersecurity are not two different disciplines — they are two lenses on the same problem. Every security failure is, at its core, a systems failure. Requirements not captured. Interfaces not documented. Components that interact in ways no one anticipated. This series applies the engineering discipline to the security domain.
The Audience
Written for defense engineers, OT/ICS security practitioners, federal professionals, and attorneys building at the intersection of technical depth and policy fluency. Published every Thursday. Each essay maps a specific parallel between defense systems engineering and an adjacent discipline.
Series Intro · Live Now June 2026
Engineering Is the Foundation Everything Else Is Built On
Cybersecurity, law, investigation, and policy are treated as separate disciplines. They are not. They are different applications of the same foundational practice — and that practice is engineering. This series makes the case.
Read Essay →
Coming Soon
The Purdue Model Was an Engineering Document Before It Was a Security Framework
The zone and conduit architecture of ICS security is systems engineering applied to network design. Understanding where it came from changes how you apply it.
Coming Soon
Requirements Traceability and Compliance Are the Same Problem
A NIST 800-53 control catalog is a requirements set. An eMASS package is a traceability matrix. DoD systems engineers have been doing compliance work for decades — they just called it something else.
Coming Soon
What Pentagon Governance Taught Me About Cyber Policy
Policy at the Joint Staff level is systems architecture by another name. How telecommunications policy at HQ AF/A6 maps directly to the regulatory frameworks governing critical infrastructure today.
Coming Soon
Systems Engineering vs. Security Architecture — Two Disciplines, One Problem
Security architects and systems engineers are solving the same problem from different entry points. The convergence is where the most interesting work lives.
Coming Soon
How Investigative Methodology Maps to Threat Intelligence
The structured analytic techniques of intelligence work are the systems engineering design review applied to adversary behavior. Hypothesis-driven analysis, structured review, documented assumptions.
Coming Soon
Missile Defense and ICS Security Are the Same Field
THAAD, Aegis, and IBCS are OT systems. The cyber-physical architecture challenges of missile defense are structurally identical to the challenges facing energy, water, and transportation infrastructure. The difference is classification level.
Coming Soon
The Interface Control Document as a Legal Instrument
ICDs define who is responsible for what at every system boundary. When something fails at an interface, the ICD is the first document a lawyer reaches for. Systems engineers have been producing legal evidence for decades without knowing it.