Zero Trust Security: A Comprehensive Comparative Analysis of Zero Trust Maturity Models

According to a recent article by The Business Research Company, the Zero Trust security market is projected to grow from ∃39.26 billion in 2024 to ∃80.58 billion by 2028 [1]. Zero Trust is a security framework based on the principle that trust should never be implicitly granted, requiring ongoing authorization and authentication for all network traffic, devices, and users. Maturity models provide a structured approach for assessing the security levels of systems or organizations, offering a clear path for continuous improvement by breaking down complex cybersecurity domains into measurable stages. However, their effective implementation in the context of Zero Trust remains underexplored, as this model requires a more dynamic, granular approach to security that challenges traditional assessment frameworks and demands a deeper integration of identity management, access controls, real-time monitoring, and adaptive policy enforcement. This paper first reviews the evolution of Zero Trust definitions and maturity models to establish a common understanding of the scope. It then investigates existing Zero Trust maturity models, evaluating their maturity levels, implementation complexity, scalability, security effectiveness, and adaptability. Through a comparative analysis, the study aims to offer insights into how these models can support the implementation and maturation of Zero Trust strategies in organizations.