What does the term "Defense in Depth" (DiD) refer to in cybersecurity?

The term "Defense in Depth" (DiD) refers to a layered security strategy designed to protect information and information systems by deploying multiple security measures across different layers of an organization’s infrastructure. This approach is crucial in cybersecurity because it creates multiple barriers against potential threats, ensuring that if one layer of security fails, additional layers remain to minimize the risk of a security breach.

In this strategy, organizations may implement various protective measures such as firewalls, intrusion detection systems, antivirus software, access controls, and employee training. Each layer adds another obstacle for potential attackers, thereby enhancing the overall security posture of the organization. This layered approach is particularly effective against diverse and evolving cyber threats, as it complicates the attackers' ability to exploit vulnerabilities.

The other choices do not align with the concept of Defense in Depth. A single point of failure represents a vulnerability in a system that could be compromised, a type of encryption technique refers to specific methods used to secure data, and network segmentation is a design approach aimed at separating different parts of a network to enhance security and performance, rather than the holistic strategy represented by Defense in Depth.