A cross-chain access control mechanism based on blockchain and the threshold Paillier cryptosystem

Si, H., Li, W., Su, N., Li, T., Li, Y., Zhang, C., Bação, F., & Sun, C. (2024). A cross-chain access control mechanism based on blockchain and the threshold Paillier cryptosystem. Computer Communications. https://doi.org/10.1016/j.comcom.2024.05.012 --- The authors acknowledge the Henan Province key research and development project under Grant No. 231111110100, the Henan Provincial Science and Technology Research Project under Grant No. 232102520006, the Henan Province key research and development project under Grant No. 231111211300, the Henan Province Key Science-technology Research Project under Grant No. 232102210122, the Key Research Project of Henan Provincial Higher Education Institution under Grant No. 23A520005.With the continuous maturation of blockchain technology and the increasing demands for various industry applications, data sharing and interoperability among different blockchain networks face significant challenges. Research on cross-chain interoperability mechanisms has facilitated data collaboration across organizations and industries, enhancing the value and utility of data. When engaging in cross-chain data interactions, access control ensures the security and privacy of data while promoting collaboration and information exchange among multiple chains. Attribute-based access control can provide fine-grained authorization support, matching complex business scenarios. However, publicly disclosed policies and attributes in a transparent blockchain network may pose privacy and security issues. To address these issues, this paper proposes a cross-heterogeneous multichain data access control scheme based on attributes and threshold homomorphic encryption, achieving fine-grained and secure cross-domain access control in cross-chain networks. This scheme uses the threshold Paillier cryptosystem to encrypt and conceal user attributes and access policies. Through smart contracts, homomorphic differential computation is performed on the ciphertext of policies and attributes, to protect data privacy. This solution leverages private key decryption shares from multiple relay nodes in the cross-chain network to jointly decrypt the computation results, providing secure access control in complex cross-chain scenarios. Security analysis and experimental results demonstrate that the proposed scheme ensures security with reasonable computational overhead, to meet the access control requirements in cross-chain networks.publishersversionpublishe

The Trickle-Down Effect of Leaders’ VWGB on Employees’ Pro-Environmental Behaviors: A Moderated Mediation Model

Although previous research has highlighted the positive effect of leaders’ voluntary workplace green behavior (VWGB), limited research attention has been given to empirically testing how and when such behavior produces trickle-down effects. Taking a role model perspective and drawing on social identity theory, this research aims to fill this gap by proposing and testing the mechanism and boundary conditions of the influencing processes whereby leaders’ VWGB can trickle down to employees’ pro-environmental behaviors. By theorizing a moderated mediation model, the current research empirically examines the hypotheses by conducting a hierarchical regression analysis. We employed a survey questionnaire research design to collect two waves of multisource data. The data used in the analysis are from survey responses of 313 subordinate-supervisor dyads at two different time points. The results show that leaders’ VWGB can have a trickle-down influence on employees’ task-related pro-environmental behavior and proactive pro-environmental behaviors through their green self-identity and that this trickle-down effect is greater among employees with higher green climate perceptions. Our results reveal the intervening mechanism and boundary condition of leaders’ VWGB by conducting a systematic examination of how this effect trickles down

Sintering and electrical properties of commercial PZT powders modified through mechanochemical activation

The effect of high-energy ball mechanochemical activation on microstructure and electrical properties of PZT from commercial PZT powder has been studied in this paper. The mechanochemical treatment destroys the large particles and refines the grains of the commercial PZT powder. The milled PZT powder can be fully sintered at a very low temperature of 950 °C, which is much lower than that of the pristine powder. More importantly, the grain growth is effectively prevented, while electrical properties of the final PZT ceramics are well maintained, due to the significant reduction in sintering temperature. It is believed that this technique can be readily extended to other materials