Distributed identity management mechanism based on improved block-chain certificateless encryption algorithm

For solving the problem of the lack of full control over the identity data of network users, we propose an identity management method based on the certificateless encryption algorithm of block chain. We also propose a certificateless encryption algorithm combined with state secret algorithm SM2 to reduce the computational cost of the algorithm by using the decentralized advantages of block chain and the characteristics of data tamper-proof. The distributed user identity management mechanism is designed. The algorithm models of user identity registration, identity certificate issuance and identity authentication are optimized to improve the security of identity data management. The model is tested and verified. The results show that the model has fast information response ability, and the average delay is about 0. 4 s. Compared with other algorithms, the scheme in this paper has the highest computational efficiency. Under the same conditions, the computational time is about 6.9% of Su et al. (2020), 63.4% of Xu et al. (2021), 7.0% of Zhang et al. (2023) , and 76.9% of Cheng (2021). The computational performance is greatly improved.