Research on Zero-trust Security Protection Technology of Power IoT based on Blockchain

With the access of massive terminals in the power Internet of things (IoT), the efficiency of information sharing is improved, but the grid boundary is increasingly blurred. The traditional centralized security management mode is facing a severe security situation, which is difficult to meet the high security requirements of the system operation. There are three main risks: 1) the execution authority of control information is not strictly controlled at the equipment level; 2) Data and authority are not separated, which makes the security management of data layer have hidden dangers; 3) Power supply chain is faced with the problems of data island, data trust and performance guarantee. Based on the characteristics of blockchain technology (BcT), such as non-tampering, collective maintenance and transaction non repudiation, this paper constructs a data protection architecture covering device layer, data layer and business layer, realizes high-level security protection of data flow in all links of power network, and improves the security management and control ability of the system. Through the scheme proposed in this paper, the implementation of control information is strictly managed, the use rights management of data is more standardized, and the credibility and interaction rate of business data are greatly improved.