A secure and dynamic trust transitivity model in decentralised trust networks of supply chain
针对中小企业融资难问题，提出一个结合D-S证据理论、图论和ElGamal加密的信任传递模型，能扩展信任链、聚合多源信任信息并保护敏感数据，适用于供应链金融场景。
Small and medium-sized enterprises (SMEs) play a pivotal role in driving global economic growth and employment. Nevertheless, due to poor trust transitivity in supply chain networks, SMEs have persistently faced financing difficulties and high financing costs. Therefore, we propose a secure and dynamic trust transitivity model aimed at addressing the challenges of multi-level trust transitivity obstruction and sensitive data transmission risks in supply chain finance (SCF). The proposed model integrates the Dempster-Shafer (D-S) evidence theory for trust awareness, the graph theory method for trust path discovery, and the ElGamal encryption algorithm for privacy-preserving trust value transmission and calculation. Through this design, the model can extend the trust chain, aggregate multi-source trust information, and avoid the exposure of sensitive enterprise data. Performance analysis demonstrates that the model exhibits good performance in security, efficiency, robustness, and reliability, demonstrating its feasibility in real-world SCF applications.