The Countermeasures Toolkit: Building Defense in Depth
Security professionals have a saying: there is no secure system, only systems that haven't been compromised yet. The goal isn't invulnerability, it doesn't exist. The goal is making attacks expensive enough that rational adversaries choose other targets, and resilient enough that successful attacks don't cause catastrophic damage.
This article assembles the defensive toolkit. Not as a checklist to implement blindly, but as a palette to draw from based on your specific context, threats, and values.
The Layered Defense Principle