Which principle emphasizes using multiple layers of security?

The principle that emphasizes using multiple layers of security is defense in depth. This approach is akin to building a fortress with several barriers instead of relying on a single obstacle to protect against threats. Each layer of security adds another hurdle for potential attackers, reducing the risk of successful breaches.

By implementing various security measures, such as firewalls, intrusion detection systems, encryption, access controls, and physical security, organizations create a more robust security posture. If one layer fails or is compromised, the additional layers provide continued protection, increasing the overall security effectiveness.

This method not only safeguards assets but also enhances the likelihood of detecting and responding to attacks before they can cause significant damage. It aligns with best practices for secure software design, ensuring that vulnerabilities can be mitigated through redundancy and layered defenses.