Overview
Defense in Depth is based on the principle that no single security measure is foolproof. By implementing a series of overlapping security controls, organizations can significantly increase the difficulty and cost for an attacker to succeed.
The Layers of Defense
- Physical Security: Locks, cameras, and guards.
- Network Security: Firewalls, IDS/IPS, and network segmentation.
- Endpoint Security: Antivirus, EDR, and host-based firewalls.
- Application Security: Secure coding, WAFs, and vulnerability scanning.
- Data Security: Encryption, hashing, and DLP.
- Identity and Access Management: MFA, RBAC, and strong password policies.
- Administrative Controls: Policies, procedures, and security awareness training.
Importance
DiD provides resilience against a wide range of threats, including zero-day exploits, insider threats, and human error.