Reactive Security

Reactive security is a cybersecurity approach that focuses on responding to security incidents after they have occurred, rather than preventing them proactively. It involves detecting, analyzing, and mitigating threats through tools like intrusion detection systems (IDS), security information and event management (SIEM), and incident response plans. This methodology is often contrasted with proactive security measures like threat modeling or penetration testing.

Also known as: Incident Response, Post-Breach Security, Security Response, Reactive Cybersecurity, Reactive Defense

Why learn Reactive Security?

Developers should learn reactive security to effectively handle inevitable security breaches in systems, as it complements proactive strategies by providing a framework for containment and recovery. It is crucial in environments with legacy systems, high-risk applications, or when dealing with advanced persistent threats (APTs) where prevention alone is insufficient. Use cases include incident response teams, compliance-driven industries, and organizations with mature security operations centers (SOCs).

Learning Resources

• docs: NIST Computer Security Incident Handling Guide
• course: SANS Incident Response Training
• course: Coursera: Cybersecurity Incident Response
• docs: OWASP Reactive Security Guide
• video: YouTube: Introduction to Incident Response