Netinfo Security ›› 2025, Vol. 25 ›› Issue (12): 1948-1960.doi: 10.3969/j.issn.1671-1122.2025.12.010

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Blockchain-Based Privacy-Preserving Cross-Domain Authentication Protocol

ZHANG Guanping, WEI Fushan, CHEN Xi, GU Chunxiang()   

  1. Institute of Cyberspace Security, Information Engineering University, Zhengzhou 450001, China
  • Received:2025-02-10 Online:2025-12-10 Published:2026-01-06
  • Contact: GU Chunxiang E-mail:gcxiang5209@126.com

Abstract:

In the Internet of things environment, cross-domain authentication faces the problems of privacy protection and reliance on a trusted third party. To address these challenges, a blockchain-based privacy-preserving cross-domain authentication protocol was proposed. With the support of blockchain technology, this protocol realized identity authentication and key exchange between entities in different parameter domains, and effectively reduced the performance burden of the server and the user. Specifically, the user’s biometric vector was generated by the fuzzy extractor to generate a secret value, and the key was calculated by combining the lattice encryption technology, so as to complete the implicit identity authentication while protecting the user’s biometric privacy. In addition, the pseudo-identity, public key and public parameters of each trust domain generated by the user in the process of cross-domain access were uploaded to the blockchain to ensure the correctness of the verification results and the non-repudiation of the behavior of the participants in the protocol. In the random oracle model, based on the decisional learning with error problem and the discrete logarithm problem, the semantic security of the protocol under the polynomial adversary ability was proved. Compared with the similar protocols, the proposed protocol is compatible with the existing security mechanisms, and has low computation and communication overhead, thus providing a new solution for cross-domain authentication with high efficiency and security.

Key words: biometric authentication, privacy preserving, blockchain, cross-domain authentication

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