Defense in Depth Strategies for Zero Trust Security Models

Abstract

The groundbreaking Zero Trust Security Model challenges perimeter-based protections in cybersecurity. As cyber threats become more sophisticated, corporations are embracing the Zero Trust philosophy of "never trust, always verify." Whether from within or outside the network, this paradigm imposes rigorous access rules and continual authentication. Zero Trust is a strong security foundation, yet it has drawbacks. The Zero Trust paradigm is enhanced by Defense in Depth, which layers several security methods to safeguard assets. This article examines how the Zero Trust Security Model might include Defense in Depth methods for a complete, robust, and adaptable security architecture. Zero Trust requires all users and devices to be verified, approved, and continually vetted before accessing resources, eliminating implicit trust. A typical method employed by attackers after breaching the perimeter is lateral movement inside the network, which this approach mitigates well. However, Defense in Depth—deploying numerous, redundant security measures throughout the IT environment—is a proven method. Defence in Depth and Zero Trust may be combined to strengthen access restrictions, detection, response, and recovery.