06·Pitfall: "Attacker Moves Second" — why static guardrail configuration is not enough

Introduction

"Attacker Moves Second" is a fundamental security principle: the attacker knows your guardrails and adapts attacks after their publication. A static filter and security model configuration deployed on day 1 is already outdated by day 30. This lesson analyses adaptive threat modelling, continuous guardrail update mechanisms, red teaming as an operational discipline, and the architecture of self-adapting systems against new attack patterns.