A Blockchain Scheme Based on DAG Structure Security Solution for IIoT

In recent years, with the increase of industrial volume, problems such as difficult management and low efficiency have become obstacles to the development of industry. Many studies have shown that industry can complete the automation of industry by combining with Internet of Things, that is, Industrial Internet of Things (IIoT), which will contribute to the secondary development of industry. However, in IIoT, there are also malicious attacks against industrial devices or sensors, such as DDoS, Sybil, etc., which will cause great security risks to the system. As a popular security trust framework, blockchain technology will face the dilemma of low throughput and limited energy if it is directly applied in the IoT devices. Based on this, in view of the existing IIoT security problems and the difficulties of traditional blockchain based on chain application, this paper proposes a blockchain security solution based on Directed Acyclic Graph(DAG) structure for IIoT, and combines differential privacy technology to further ensure the privacy and integrity of data. In order to ensure the stability and anti-interference ability of the network, this paper also proposes a load balancing algorithm, which effectively balances the relationship between node power consumption and network lifetime. Finally, the simulation results show that the proposed scheme is superior to the chain-blockchain scheme in network performance and power consumption. The average network delay is reduced by 24%, and the average network lifetime is increased by 48%.