Cyber Security: Securing Multi?Tenancy Enterprise Platforms with a Zero?Trust Approach

In multi-tenant environments, attackers may exploit vulnerabilities in shared resources to gain access to sensitive data across tenant boundaries. Assumed adversaries are those capable of lateral movement and forging tenant identifiers. This paper focuses on defending against these threats by employing a Zero-Trust security model. Multi-tenancy serves as a foundational paradigm for cloud-native enterprise platforms and Software-as-a-Service (SaaS) applications. Although this architectural approach enhances scalability and cost efficiency, it also increases the complexity of enforcing data isolation, tenant identity validation, and access control. Traditional perimeter-based security models are inadequate for modern distributed systems. Existing solutions frequently lack comprehensive methods for integrating tenant-specific security policies and adapting to evolving threat landscapes. This paper introduces an enhanced Zero-Trust security architecture for multi-tenant platforms that incorporates fine-grained access control (FGAC), tenant-scoped identity enforcement, and data-layer authorization leveraging AWS Identity Access Management and DynamoDB [4]. The proposed implementation includes detailed policy examples and integration steps, including configuring IAM policies and establishing tenant-specific security rules in a multi-tenant environment. By addressing these gaps, the approach aligns with contemporary Zero-Trust principles and addresses critical security challenges identified in recent academic literature.