What does defense in depth refer to?

Defense in depth refers to a cybersecurity strategy that employs multiple layers of security controls to protect information and systems. The core idea behind this approach is that if one layer of security fails, additional layers will provide backup protection, thereby reducing the risk of a successful breach. This strategy helps to ensure that an organization’s data is safeguarded from various types of threats, including unauthorized access, data breaches, and other vulnerabilities.

In a defense-in-depth framework, different security measures—such as firewalls, intrusion detection systems, antivirus software, and physical security—work in concert to create a robust security posture. This multifaceted approach not only enhances protection but also improves the organization’s ability to respond to security incidents effectively. By combining various types of security measures, an organization can create a more complex environment for potential attackers, making it more difficult for them to gain access to sensitive data or critical systems.