A Certificateless and Dynamic Conditional Proxy Re-encryption-based Data Sharing Scheme for IoT Cloud

The wide application of IoT Cloud makes the data security become a big concern for public. Although many secure data sharing schemes have been developed for Cloud data, most of them cannot fully meet the requirements of IoT Cloud, or fail to give consideration to efficiency on the premise of stable running under the resource-constrained IoT situations. In this paper, we propose a secure data sharing scheme that combines certificateless public key cryptography and proxy re-encryption to achieve multi-level data access control. Moreover, dynamic key update and ciphertext evolution are realized to effectively decrease the risk of key leakage. Quantitative performance analysis shows that the proposed scheme not only support privacy-preserving data sharing in IoT Cloud, but also has higher efficiency, and therefore it is more practical for IoT Cloud.