Security Monitoring and SIEM — Watching for Threats in Real Time
Log aggregation, SIEM concepts, anomaly detection, alerting strategies, and tools overview
Prevention is critical, but it's not enough. No security posture is perfect. Eventually, something will get through — a sophisticated attacker, a zero-day vulnerability, an insider threat. When that happens, the difference between a minor incident and a catastrophic breach comes down to one thing: how quickly you detect and respond.
The average time to detect a data breach is roughly 200 days (IBM Cost of a Data Breach Report; the exact figure varies by year). That's almost seven months of an attacker having access to your systems before anyone notices. Security monitoring exists to bring that number down to minutes or hours.
The Monitoring Stack
Security monitoring is built on three layers:
Log Collection — Gathering data from every system in your environment. Applicat
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