Defence in Depth Definition:
Defence in Depth is a cyber security strategy that employs multiple layers of security controls and measures to protect an organisation’s assets. By implementing overlapping defences at different levels, this approach aims to provide redundancy, making it more difficult for attackers to breach a system, and ensuring that if one layer is compromised, others still stand to protect the network or data.
What is Defence in Depth?
Defence in Depth encompasses a wide range of security measures that work together to provide comprehensive protection. These measures can include network Firewalls, intrusion detection and prevention systems, data Encryption, access controls, endpoint protection, security training, and more. Each layer addresses different aspects of security, creating a holistic defence that is resilient against various attack vectors.
Why is Defence in Depth important?
The purpose of Defence in Depth is to mitigate the risk of a security breach by creating multiple barriers that attackers must overcome. By layering security measures, organisations can delay or prevent attacks, increase the likelihood of detection, and reduce the overall impact of a breach. This approach recognises that no single security measure is foolproof and aims to provide a robust, resilient security posture.
How does Defence in Depth work?
Defence in Depth is achieved by combining various security layers, such as perimeter defences like Firewalls, network segmentation to limit access, endpoint protection for individual devices, user training to minimise human error, and continuous monitoring for suspicious activity. Each layer addresses specific threats and provides redundancy in case one measure fails, ensuring the overall security posture remains strong.
Defence in Depth Examples:
Examples of Defence in Depth include using Firewalls to block unauthorised network traffic, deploying antiVirus software on endpoints, encrypting sensitive data, and implementing access control policies that limit user privileges. Security Awareness Training for employees adds another layer by reducing the risk of Social Engineering attacks. Regular Patching and updates are also part of a multi-layered security approach.
Defence in Depth Issues:
While Defence in Depth provides robust protection, it can be complex and costly to implement and manage. Ensuring that different security measures work together effectively and are regularly updated is essential to maintaining a strong security posture. Overlapping defences can also lead to false positives, operational inefficiencies, and potential gaps if not properly coordinated. Continuous assessment and improvement of the security layers are necessary to stay ahead of evolving threats.
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