What is "defense in depth"?

Defense in depth is a comprehensive security strategy that incorporates multiple layers of protection to safeguard an organization's assets. This approach ensures that if one security measure fails, additional measures still provide protection, thereby reducing the risk of a successful attack. The concept recognizes that no single security control or layer is completely foolproof against threats. By implementing various layers—such as physical security, personnel training, firewalls, intrusion detection systems, and encryption—a more robust defense is achieved that addresses different potential vulnerabilities.

This multi-layered approach is crucial in creating a resilient security posture, as it complicates an attacker’s path to success, requiring them to overcome multiple obstacles rather than just breaching a single point of failure. Thus, the strategy enhances the overall security framework and plays a fundamental role in integrated defense practices.