RTB-RM: A Blockchainenabled System for Reliable and Transparent CTI Sharing with Multidimensional Reputation Model

The continuous evolution of network threats has made Cyber Threat Intelligence (CTI) sharing an essential strategy to counter these challenges. However, existing CTI data-sharing models face challenges such as establishing and maintaining trust, lacking flexible sharing strategies, and lacking mechanisms for dispute resolution. To address these issues, this paper proposes a reliable and transparent CTI data-sharing framework based on blockchain (RTB-RM). RTB-RM utilizes a Multidimensional Reputation Model (MRM) to assess user trustworthiness, thus enhancing the credibility of CTI data. It adopts a selective data-sharing approach based on trust levels and sensitivity, balancing the demands of data-sharing and security considerations. Additionally, RTB-RM employs real-time arbitration for dispute resolution. Our experiments validate the cost-effectiveness of RTB-RM and the effectiveness and rationality of MRM in evaluating user reputations and parameter configurations. RTB-RM demonstrates the immense potential and advantages of blockchain technology and multidimensional reputation models in enhancing the reliability and transparency of CTI data sharing.