What does the concept of defense in depth refer to?

The concept of defense in depth refers to a comprehensive security strategy that employs multiple layers of security controls to protect information and systems from threats. This layered approach ensures that if one security measure fails, additional measures are in place to provide protection, thereby minimizing the chances of a successful breach.

In defense in depth, various security layers might include physical security controls, network security measures, application security protocols, and user training. For example, an organization might use firewalls, intrusion detection systems, encryption, and employee training on security practices all in conjunction to create a robust security environment.

This strategy is favored in cybersecurity because it addresses potential vulnerabilities at different levels, making it harder for attackers to penetrate systems and gain unauthorized access to sensitive data. By having multiple defenses, organizations can better withstand attacks and mitigate risks effectively.