An Efficient Cross-Domain Fine Grain Proxy Re-encryption Scheme for Secure Transmission in IIOT

As Internet of Things (IoT) technology continues to advance swiftly, a growing array of IoT devices is being assimilated into the industrial IoT framework. However, ensuring secure and efficient transmission of data from IoT devices has become a key technological focus in current research on the development of industrial IoT. Attribute encryption technology is an effective encryption technique that ensures data security; meanwhile, proxy re-encryption technology allows proxies to encrypt original ciphertext into new ciphertext without accessing any plaintext information. The combination of these two technologies enables secure transmission of data among users with different attributes. However, the high computational overhead remains a significant factor limiting the development of this solution. IoT data needs to be shared not only among different units within the same domain but also across units in different domains. Securing shared data has emerged as a pivotal area of focus in contemporary research. In this article, we propose an improved fine-grained proxy re-encryption scheme for cross-attribute domains, which not only facilitates simple cross-domain data sharing but also enhances encryption efficiency. Security proofs demonstrate the adequacy of our proposed scheme, and performance analysis indicates its superiority over other solutions in certain aspects.