主从链下的物联网隐私数据跨域安全共享模型

为了解决各个信任应用域之间的跨域安全问题，保证隐私数据的跨域共享，利用区块链技术构建了基于主从链的隐私数据跨域共享模型。首先构建了主从链，并提出基于主从链的跨域共享模型架构；设计了基于智能合约的跨域访问机制，并基于跨域访问机制提出了面向隐私数据的跨域安全共享方案；最后，对模型的稳定性、吞吐量、存储开销等方面进行了实验及对比分析。实验结果表明，该模型同最新的单链跨域模型相比，吞吐量提升了270 TPS左右，节点的平均CPU负载和平均内存开销分别下降了24%和64%；同现有多链跨域模型相比，节点的平均CPU负载和平均内存开销分别下降了15%和20%，为物联网隐私数据的跨域安全共享提供了一种有效方法。

Cross-domain sharing model of IoT privacy data under master-slave chain

In order to solve the security issues of each trusted application domain, to ensure cross-domain sharing of private data, this paper proposed a cross-domain sharing model of private data based on the master-slave chain. Firstly, it presented a master-slave chain, and constructed a system architecture based on the master-slave chain. Then it designed a cross-domain access mechanism based on smart contracts, and put forward further the cross-domain secure sharing scheme for private data. Finally, an experimental analysis for stability, throughput and storage overhead for the proposed model was carried out. The experimental results show that, compared with the latest single-chain cross-domain models, the throughput has been improved by about 270 TPS, and the average CPU load and average memory overhead of the node are reduced by 24% and 64% in the proposed model respectively; compared with the existing multi-chain cross-domain models, the average CPU load and average memory overhead of the node has dropped by 15% and 20%, respectively. The proposed model has provided an effective method for cross-domain secure access and sharing for the Internet of Things privacy data.