关键词: 配电物联网, 区块链, 接入认证, 共识算法, 权重机制, 可验证随机函数（VRF）

Abstract: With the deep integration of the Internet of things and the distribution network, the access system of massive terminal equipment brings great challenges to the safe and stable operation of the distribution Internet of things. In view of the current situation that the traditional identity authentication method is too centralized and cannot carried large-scale terminals, a terminal access authentication method based on the blockchain consensus mechanism is designed. The power distribution Internet of things gateway is responsible for the registration of the nodes to be accessed, uses the consensus algorithm for distributed authentication, and stores the legal terminals on the chain. Based on the practical Byzantine fault-tolerant algorithm, a consensus algorithm for the distribution IOT terminal is proposed. The algorithm introduces a weight mechanism, selects authentication nodes according to the weight of terminal nodes, and reduces the scale of consensus. The verifiable random function is introduced to enhance the security of the master node, avoids view switching protocol, and improves the consensus efficiency. Combining with the actual application scenario, the consistency protocol is optimized to reduce the communication overhead. The experimental analysis shows that this method can effectively avoid various network attacks, and the communication overhead and throughput are better than other methods. The system has strong anti-attack ability, and meets the requirements of the distribution Internet of things for authentication efficiency and system reliability.

Key words: power distribution Internet of things, blockchain, access authentication, consensus algorithm, weight mechanism, verifiable random function