Certificate-Based Proxy Re-encryption+ Scheme in Digital Twin Smart City

Digital twin smart cities are gradually developing, but there are security issues in storing and sharing large amounts of data. It is crucial to maintain data security and privacy when sharing data. However, there are still limitations in the granularity control of existing encryption techniques. In this paper, we provide a Certificate Based Proxy Re-Encryption+ (CBPRE+) scheme and apply it to the smart city construction to solve the problem of private data transmission and processing therein. The scheme enables the private data to be sent securely to the receiver. Meanwhile, the scheme implements message-level fine-grained control and non-transferability features to ensure that the data can only be accessed by authorised recipients, preventing the leakage of private data. After performance analysis and simulation experiments, the scheme is verified to be secure and enhanced in performance, which is more suitable for secure data sharing in smart cities. In conclusion, our proposed CBPRE+ scheme has more advantages.