What is the principle of defense-in-depth?
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The principle of defense-in-depth is a cybersecurity strategy that involves implementing multiple layers of security controls to protect against potential cyber attacks. This approach aims to provide multiple barriers that an attacker must overcome before successfully compromising a system or network.
The principle of defense-in-depth involves the implementation of several distinct protective layers, which may include both technical and non-technical measures. These layers are designed to complement each other and provide overlapping protection, so that if one layer is breached, other layers can still prevent an attacker from accessing sensitive information or systems.
Some examples of protective layers that can be part of a defense-in-depth strategy include firewalls, intrusion prevention systems, antivirus software, access controls, network segmentation, encryption, and monitoring and logging tools.
Additionally, authentication, authorization, and accounting mechanisms (also known as AAA) can be an important part of a defense-in-depth strategy. These mechanisms help to control who has access to sensitive systems and data, what actions they can perform, and track their activities for auditing and forensic purposes.
Overall, the principle of defense-in-depth is an important concept in cybersecurity that helps to ensure that critical systems and data are protected from potential threats. By implementing multiple layers of security controls, organizations can increase their resilience to cyber attacks and minimize the risk of data breaches and other security incidents.