Cyber – Fundamentals

Fundamental principles: security versus safety, structural limits, resilience, and system design.

This section brings together in-depth articles aimed at clarifying the principles, limitations, and structural realities of modern information system security.

It addresses the concepts of security, safety, resilience, and system design, independently of tools, products, or transient trends.

Linux, Windows, macOS: Understanding Kernel Architectures

February 4, 2026 ·4 min · cyber · fundamentals

What Really Sets Them Apart, at a Fundamental Level Comparisons between Linux, Windows, and macOS almost always focus on the graphical interface, the software ecosystem, or mainstream use cases. That is secondary. The truly structuring difference lies at the kernel level. Not in ergonomics. Not in visible options. But in the very architecture of the operating system. And at that level, the range of possibilities is surprisingly limited. Three Kernel Architecture Families.

kernel architecture operating-systems fundamentals

Everything That Is Not Explicitly Authorized Is Forbidden

January 29, 2026 ·6 min · cyber · fundamentals

Introduction: This statement is ubiquitous in discussions about information system security. It appears in training materials, documentation, and operational guidelines, particularly in the context of network filtering and firewall configuration. It expresses a legitimate intention: to reduce the exposure surface by strictly limiting what is accessible. Used as a methodological framework, it makes sense. But its actual scope is very often overestimated.

cybersafety open-source architecture defense