Article
Blockchain Based Privacy Preserving Cross Domain Authentication Scheme
Modern distributed computing environments require secure authentication across organizational boundaries without exposing sensitive identity credentials. Existing cross-domain authentication solutions rely on centralized trusted third parties, creating single points of failure and privacy vulnerabilities. This paper proposes a Blockchain-Based Privacy Preserving Cross Domain Authentication Scheme (BP-CDAS) combining zero-knowledge proof (ZKP) protocols for privacy-preserving credential verification, Ethereum smart contracts for trustless authentication management, and decentralized identifiers (DIDs). The scheme eliminates centralized certificate authorities by distributing trust across a permissioned blockchain consortium. Security analysis demonstrates resistance to impersonation, replay, and man-inthe-middle attacks. Performance evaluation shows average authentication latency of 1.8 seconds with throughput of 180 authentications per minute, suitable for enterprise federated identity management.
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