Research on Blockchain Implementation Algorithm for Decentralized Identity Authentication System

This paper focuses on the implementation of decentralized identity authentication system and designs an innovative algorithm based on blockchain technology, aiming to improve the security, privacy and decentralization of the system. The algorithm proposed in this study implements encrypted storage and distributed authentication of identity data through distributed ledger and smart contracts of blockchain, ensuring the privacy and data security of users. The hash function and zero-knowledge proof method are introduced, so that the user's identity information does not need to be transmitted in plain text during the verification process, further improving the security of the authentication process. The model simulation part uses real data sets to test the system many times, covering key performance indicators such as response time, authentication success rate, throughput and system load. The experimental results show that while ensuring security, the system's response speed has improved by about 18%. The authentication success rate is more than 99%, and it still maintains high stability under high concurrency conditions. These results verify the effectiveness and practicality of the proposed algorithm, and provide theoretical and technical support for the application of decentralized identity authentication system in the future.