POLARIS: Cross-Domain Access Control via Verifiable Identity and Policy-Based Authorization

TL;DR

POLARIS introduces a novel, privacy-preserving, policy-based access control framework enabling secure cross-domain resource sharing with verifiable identities and flexible authorization.

Contribution

It presents POLARIS, a comprehensive architecture with a new policy language and security mechanisms for scalable, privacy-preserving cross-domain access control.

Findings

Effective policy-based identity disclosure mechanism

Lightweight attribute evaluation language VPPL

Prototype demonstrates scalability and privacy preservation

Abstract

Access control is a security mechanism designed to ensure that only authorized users can access specific resources. Cross-domain access control involves access to resources across different organizations, institutions, or applications. Traditional access control, however, which handles authentication and authorization separately in centralized environments, faces challenges in identity dispersion, privacy leakage, and diversified permission requirements, failing to adapt to cross-domain scenarios. Thus, there is an urgent need for a new access control mechanism that empowers autonomous control over user identity and resources, addressing the demands for privacy-preserving authentication and flexible authorization in cross-domain scenarios. To address cross-domain access control challenges, we propose POLARIS, a unified and extensible architecture that enables policy-based, verifiable and privacy-preserving access control across different domains. POLARIS features a structured commitment mechanism for reliable, fine-grained, policy-based identity disclosure. It further introduces VPPL, a lightweight policy language that supports issuer-bound evaluation of selectively revealed attributes. A dedicated session-level security mechanism ensures binding between authentication and access, enhancing confidentiality and resilience to replay attacks. We implement a working prototype and conduct comprehensive experiments, demonstrating that POLARIS effectively provides scalable, privacy-preserving, and interoperable access control across heterogeneous domains. Our results highlight the practical viability of POLARIS for enabling secure and privacy-preserving access control in decentralized, cross-domain environments.