The Rapid Proliferation Of Data-driven Services Across Healthcare, Finance, Government, And Enterprise Domains Has Intensified The Need For Secure And Privacy-preserving Data Sharing Mechanisms. However, Cross-domain Data Exchange Is Often Hindered By Regulatory Restrictions, Heterogeneous Access Policies, And Concerns Over Data Misuse. Existing Solutions Either Rely On Centralized Intermediaries, Which Introduce Single Points Of Failure, Or Expose Sensitive Information During Interoperability Processes. To Address These Challenges, This Study Introduces Privacy Passport, A Novel Framework For Privacy-preserving Cross-domain Data Sharing. The Framework Integrates Attribute-based Encryption (ABE), Zero-knowledge Proofs (ZKP), And Blockchain-based Auditability To Ensure Fine-grained Access Control, Verifiable Trust, And Compliance With Diverse Data Governance Policies. Instead Of Transferring Raw Data, Privacy Passport Enables The Issuance Of Cryptographically Secure Access Tokens—"passports"—that Validate User Attributes And Access Rights Across Domains Without Revealing Underlying Sensitive Information. Experimental Evaluation Demonstrates That The System Achieves Scalable Performance, Reduces Communication Overhead, And Resists Unauthorized Access While Maintaining Interoperability Between Heterogeneous Domains. By Combining Cryptographic Assurance With Policy Enforcement, Privacy Passport Establishes A Foundation For Secure, Auditable, And Regulation-compliant Data Sharing In Multi-domain Environments.
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